Simple but cool idea. I had fun.
I kinda ended up getting very overpowered after failing towards the end of stage 2 twice and then using all those materials to make potions. Even defeated the final boss in a single jump.
There seems to be a graphical issue. The window size is wrong and the UI is on the left side of the frame for some reason.
I tried it in Edge and Firefox and it was broken both times.
I also found the option of using Enter to interact but X to craft the potion kind of weird. Ended up feeling a little clunky when trying to craft a lot of potions.