I gotta say that this (like others have mentioned) is one of the juicier games I've seen come out of a jam. You have a great aesthetic going, and the cutscenes are simple, but convey very well.
I like that you introduce multiple ways to play with the mechanics -- though I feel like thematically, you should shoot stuff first, THEN learn to move with the shots. Obviously from a gameplay perspective, it makes much more sense to do it the way you did, and you told the story in a way that sells it, too.
I did find that in the harder levels, I was able to spam-click the mouse and the arms would flail enough and I'd shoot enough bullets that I'd just win eventually (I tested and also got it to work against the bosses).
That aside, this game was a lot of fun.