Hi! I tried out the game, I wanted to say good job for starts. I really like the character and the death transitions. The overall feel is really nice. The jump for me is very floaty, kinda like space haha. Adding some downward velocity when not grounded might help that a bit. Unless floaty is what you were going for, then it works pretty well. Also, I don't know if there were any sound in the game? The browser didn't pick up any so it was silent for me at least.
I also made a platformer for the game jam if you want to check it out: https://jpragasa.itch.io/rockblasta
I'm more than open to any feedback as well!
Thanks for the fun experience :)