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very good graphics and gameplay.

Great demo, very fun and addicting! (I spent a little too much time playing it when I had other things to do). Although some of the mechanics are not so obvious at first, once I understood them all I felt like I was really in control, and appreciated every mechanic.

I definitely second everything said in the other two comments, but I have a couple things to add as well.

Alchemy:

One of the biggest issues I had was with the fact that the alchemy requires exact levels of the ingredients, combined with there being no way to actually undo adding an ingredient (there's the minus, but that uses more rather than giving back). Early on, I had thought the levels didn't need to be exact, due to the fact that for the regular blue or red potions, it completely ignores the other color. This led to me, in later game, adding a bunch of ingredients to make the level 5 potion, only to realize I didn't have enough red/blue mushrooms to make it exact. To make matters worse, since there no "clear" option, I had to use even more ingredients to bring the levels back down after.

I get that this is intentional to require exact amounts, but perhaps either make it exact for all or none of them, or at least allow an undo option in case it's misunderstood. As Kamoo suggested, having a tutorial here would help too.

One other thing I was thinking was that it felt like I didn't have a lot of freedom to experiment with different "deck" combinations, since everything is only ever upgrading the cards already there. That's one aspect I really love about deck building games.

Progression:

I understand that the progression is intended to make it more challenging and avoid grinding. However, there are a couple issues I had with it.

First, the fact that you can't replay a level is a little frustrating. This can easily make it such that if you make mistakes early on, these compound later, making it very difficult to catch up. It's not very friendly to people who take a bit to get used to the mechanics.

Second, per my above frustration, the mushrooms from early on are essentially required for the later potion levels to get them to match exactly. Since you only are pushed deeper, and don't find the mushrooms later, you will be screwed over if you didn't save some mushrooms early on.

Other Minor Things:

After completing the demo, I couldn't help but feel like I could have gotten a better outcome had I made it deeper into the last section, Though there was no obvious indication if this were the case, so perhaps there could be an indication there was nothing you could have done to change that outcome, or if there was invite you to try again?

Last minor thing, which you'd probably update for the final release anyway: It would be good if the characters had different images for different expressions depending on the mood. Since this is a demo though, I totally understand it not being fully polished with things like that. One thing in particular I noticed was at one point Twig said Lizard was in her cloak, but in the image he was still sitting on her staff.

I do like the approach of making the mechanics mysterious / visual only. I don't think I struggled with any particular mechanics but the biggest one I'd look at is the 'walking in / out of the woods' options. They both look very similar and it's hard to notice the difference or the changes it's making on the gauge on the left. It may also be hard to notice its flipping mechanic because it seems like a completely free pick you want out of the top row immediately ... My suggestion would be to have a clear UP/DOWN arrow and have that arrow turn when it flips so it's clearer about what's going on there.
It's also not immediately obvious when you're prevented from progressing further into the woods, which feels frustrating seeing some sort of 'checkpoint' that you're prevented from reaching ... Doubly so when you avoided some camp cards to get there, and now you're stuck waiting until camp comes again.
It's also weird that 'moving back towards the campfire' has no clear connection to when the 'you can now camp' cards come up.

Because the top and bottom slots of the staff work differently, some of the mechanics need to be better visually indicated to show they aren't bugs. For example a 3 dot potion in the bottom of the staff while there's a 1 dot of the same potion on top seems to discard the one on top, despite the fact I've never seen this happen at any other time. The fact that the top slot also wastes all its charges instantly versus the bottom slot only consuming some of its charges is also... There's nothing that shows that it's acting differently, even though the slots act differently in that regard. I originally thought these were bugs.
The different slot mechanics are probably a good thing, though. It's more enjoyable that you're trying to not waste potion charges but you have limitations that might make you waste them.

The 'store threat for later' bottle is easy to forget about, having it react more when dragging a potion over it (something you'll do naturally) would help remind the player it's there, or giving it a clear slot for a potion to go into.

The most frustrating thing I've found is that by the time you reach the deep part of the woods, if you've been saving up mushrooms, you have no space for the fancier plants which will now sit in your inventory and... Apparently, it's not counted as being held by you. If the inventory is going to be strict like that instead of letting the player hold onto plants at the expense of inventory space for potions & such then it should have a clear indication of when you're reaching max capacity... or that sending one plant into your inventory at a time is a bad idea.
Though, the question is, 'should I be concerned about getting better plants so I can get better upgrades to proceed further into the woods' since the progression seems to be tied to a counter when you camp instead, and there's no indication of a boss or threat or anything time-critical looming on the horizon. 

The biggest thing I feel is missing is a sense of 'travelling', and that sense of something bad on the horizon that you need to prepare for that's worth foraging more cleverly/in the deep forest for. The 'not us' is introduced but when it's introduced it poses absolutely no threat, it simply exists. It may be better to withhold the visual or make it look like a recall/memory than a thing that the player is looking at, something to say 'this is a threat, but not right now'. If there's no end to the current demo, I think it'd be good to have the last leg of the journey be the player starting in a dangerous part of the forest so the player should have upgraded their potions/forest helpers by then to survive and make it through. Just my thoughts, not sure what the intention truly is yet, I made sure to at least fill the 'Forest' / day counter to full.
Yeah, sorry, I ramble a lot.

In any case, love the art / ambience. Keep it up!

After playing the game for about an hour I've got to say that I really like it. I really love the aesthetics and vibes of the game and I like how different of an approach to a solitaire like game this is. Though, at first I was a little upset by the game as I was really confused as to what I was doing and what the cards I was using did. After a few minutes, however, I realized that that is the whole point; I have to use trial and error and the clues to figure out what each card does

Since I'm the first person to comment I'll give some feedback. The default font size is a little small but I liked that I was able to change it. At first I didn't notice that there was an info panel that explains the mechanics so perhaps some dialog/pop-up would help people that didn't understand the tutorial. I also didn't realize the purpose of the alchemy system at first so some additional tutorial there would be helpful as well. 

Another option is adding some start-up/new-game text informing the player that not everything will be explained and that they have to experiment.

Overall this is a really good demo with relatively minor problems, so I'm super excited to see how the game develops!