Cool little game with a neat soundtrack and a really interesting 90s artstyle, and I love the comically large fist attack! Unfortunately, I also found it pretty obscure and difficult to play.
Not being able to hit the first boss when he seems to be the most vulnerable (your fist goes over him when he's on the ground, and you can't crouch or aim down as far as I could tell) feels pretty bad. On the other hand, he always seems to hit me easily even when I think I can jump over or run under him. Coupled with him becoming invisible when I do hit him, all this made for one annoying fight.
(The movement pattern and overall idea is actually very neat, just a bit too fast imo and with too large a hitbox compared to how fast your character can get out of the way, and the invisibility doesn't help.)
After half an hour or so, I was really close to giving up, but I ultimately managed to squeeze by somehow, and the second boss seemed much, much easier in comparison. Though by the time I found the ice key and got to the area with a ton of enemies and acid pits, I decided I needed a break for now.
Still, it's a very neat project with a really unique sense of identity, and I might give it another shot some time!