I love the idea of a ASCII bullet hell. The whole "you have to move to shoot" thing just doesn't work for me though. The second phase doesn't seem to target you at all, so you can just sit in one spot and win. This just makes for a really not fun game, because the best strategy is to sit in one spot, only move slight bit before the circle expands enough to hit you, and then move right back, rather than actually trying to get through it at a reasonable speed.
Also the whole "this is an open source community project" and "it isn't just a game" thing is just baiting good ratings. I think the idea of making it open source is really cool, especially considering this seems to be a kinda "math-y" game. I really do think you should have left that until after the jam though.