Super cool mini dungeon crawler !
I really like the atmosphere that the music sets, the monster sprites have some nice design to them and i like the nuclear throne style they got, mouse and keyboard fits just right for this type of game made everything really smooth. It was quite fun to see the various different powerups you can endup combining, don't know how many there are but it seems like there's quite a lot of possible combinations.
So i played the web version at first and performance seemed right at first... then i reached level 4 and yeah i see why you warned about this, so i played the windows version then, much better but i do have to note while not game breaking, the game still drops a few frames when there's a large group of enemies, but not as badly as the web version.
Managed to reach the witch but couldn't beat her, the difficulty seemed all right though, but i feel the boss can feel harder depending on which items you encountered along the way so more of an rng thing than a balance thing i'd say.
Not much else to say, had a good time, good job :) !