Pretty fun. The bat should swing a dit differently to make it a more effective weapon, and there should be acheivements. There are a few improvements that I'd suggest, but other than that, an excellent game.
Yeah. I wasn't rly trying to make a super-original game. It's really hard to make something totally original these days, but easier (and in many cases, best) to improve upon an existing formula. I think that Hikouki III will do so.