The artist deserves to be full of themself, this is really nice for a project with so much time pressure!
The bugs and overall jankiness are certainly the biggest issue facing the game. Some stuff is endearing, like the chain crazily stretching or launching yourself into the air by pressing against a wall and mashing jump, but they do sometimes make things awkward to control or leave one character totally off-camera.
A more robust tutorial would have also been lovely. It wasn't hard to figure out, but it certainly wasn't clear.
The idea is a lot of fun, and the mechanics of tossing the bomb back and forth feel natural and interesting! The character's body types and abilities work really well together. The level design was occasionally awkward or obtuse, but generally presented interesting challenges.
Also, your itch page is fantastic. That sort of playfulness makes me feel good about your game before even downloading it.
Great work here!