Absolutely love the aesthetic and the environment, really strong. Especially the entry sequence, fantastic.
I found the best strategy for almost all the bosses to be dash in - triple kick - dash away - repeat. I wish you made the weapons stronger, since it was always cool to get one, but any time i tried to use them instead of doing the above I'd just take damage and go back to my dashing triple kick strat. Also was there any significant reason to use punch over kick or vice versa? I wish you differentiated them more, give the player a really good reason to use punch and a really good reason to use kick, they felt very interchangable.
For the second boss I wish the homing missle wouldn't follow you after you jump over it. As it stands, the only way I could figure out to deal with it was to run to the other side of the map, which just felt lame to not be able to do anything for 5 seconds.
Could use some more juice, add more screenshake, particle impacts for attacks, stuff like that.
My biggest critique is your control scheme. Maybe there are a bunch of games with a similar control scheme but if there are I don't play any of them, so it's extra unnatural for me. Forcing both of my hands to be on the keyboard is bad enough, but having the most important ability (dash) be on shift instead of somewhere my right hand can reach feels like a slap in the face, after specifically forcing my hand to be on the keyboard. Please at least add an option involving the mouse buttons and E,F, R, T, G, or 12345 for abilities, my muscle memory was about to commit suicide :(
Besides that, beating each boss felt very rewarding. Barely dashing past the edge of the enemys blade felt awesome, and the boss designs were very cool. If I had an option for setting my own keybinds, or could use my right hand on my mouse anyways, I'd love to play through this again.