What a unique visual identity! Plus, a nice, juicy punch sound and some solid music. Nice!
I'm going to borrow a comment I'd made on another jam entry because it's relevant here, too:
The levels feel too bland gameplay-wise because I'm walking in a straight line too often and it gets boring. If you ever get the chance, studying AAA level design would be really useful here. One of the things they do is constantly mix up which direction you're moving in (literally breaking up straight lines), the context you're moving in (combat, stealth, town, climbing), and which movement mechanics you're using to progress (walking, running, crouching, jumping, climbing, etc.) This stops the player from tuning out due to repetition.
Also, 10/10 start screen. Loved that.