you asked for no holding back on discord so I will do my best :)
overall its a great entry, played quite a bit and had fun! the retro visuals are super nice, but the music was a bit too much for me, and I think some SFX were too much also (e.g. the sliding bar to turn the volume down doesnt need to itself have a volume IMO)
the gameplay is quite interesting, I like the idea of making potions to solve the puzzles. And I like the added element of having to think ahead because you can't always find the resources you need around you.
the speed potion took me a little bit to figure out, because it seemed like you have to start off at a certain position to actually make it across. I tried many times just drinking and running through and fell, so it was a bit frustrating. But eventually I learned to make the jump consistently, but I think it could be a bit easier
I only realized now that you could keybind new keys to move super late, so I spent most of the game doing everything with WASD + E + 1234 so it was quite repetitive. I think the default can be to move/select things with the arrows, so the player uses both hands more evenly. Or at least make it more clear that its possible to change the keys
despite the comments I still had a lot of fun! The atmosphere is super nice and I think you created a really fun retro-looking game. The potions and the puzzles are really cool, well done