Thanks a lot for the comprehensive feedback!
Having debuffs was an "aha" moment during the design, I couldn't come up with more debuffs in the time time though. I didn't consider limiting abilities, that may be an idea.
In regards to AI: the big thing I would have liked to do was make them actually jump towards platforms, rather than do so randomly. More complex AI features would have been nice as well, but had to limit the scope for the jam. Another problem was the levels, I rushed them in the last couple hours, so enemies tend to get stuck in the pits of the levels. If the AI was smarter, or the levels were laid out differently, it could have been a lot better.
More polish to the attacks was certainly needed. Screen shake was literally on the to do list, but I just left it until the very end and there was no more time.