Thank you for your review and playing the game.
There are some successful games based on frustration. For example, Getting Over It by B. Foddy. In our case, I feel that you can really practice it to master it without frustration. Then the changes in the game should even develop your brain (improve its plasticity) because you are doing things differently.
We have tried to set cooldown to make the game a bit harder and to avoid drinking position continuously. I also found cooldown frustrating at the beginning but later it made sense. Anyway, thanks for the comment, we will discuss it. Final-tuning of the difficulty it really "watchmaking work".
Definitely, we recommend using controllers. The Xbox controller buttons even match the potions' colours ;). When the potion effect changes in different parallel worlds, then it is easier to be oriented to what are you pressing. For WSAD combination it is also possible to use num lock numbers, or we should maybe map numbers to 7-0 instead of 1-4. The truth is also that many notebook keyboards don't have comfortable arrows to play. Also thanks for this comment.
Also sorry for the initial freezing - it was particles, we already solved it (not in Jam version).