visuals are cool, music is nice, the control feels solid. overall definitely needs tweaking, i would suggest adding some sort of indicator when punching, even a sound effect to confirm that you landed a hit. was hard to tell if the game was even working properly at first.
the tutorial boss was unkillable, don't know if thats intended or what. also the doors you unlock on the only real level feel odd that they only open when youre near them. perhaps if you cant figure out a way to keep them open or whatever, maybe you could even just add a visual indicator that they are unlocked (maybe i missed it) it was intuitive enough that i figured it out and beat the level but those are my thoughts. would like to see more.
oh yeah grabbing the cassette too was weird it almost didnt work i had to fiddle around with where my guy was standing in order to pick it up, i think i got a gameboy at some point too which i have no idea what it did. also after dashing or something my guy was stuck not being able to move down but i simply dashed and the bug resolved itself.