That's a pretty good start! I like your Git commit history :P
It's cool to have an intro sequence, and the gameplay and art work fairly well.
My main criticisms would be the same as others already expressed here, and mostly reflect lack of time I suppose: visual feedback on hits, difficulty (first corridor easy, second one OP :D), text goes too fast (and maybe too much of it initially, we're interrupted with every other step), maybe too many hits needed to fell an enemy (especially those bowling balls with no feedback on it, it's not juicy enough :)).
Overall it's solid though, and I didn't run into any actual bug that I could identify as such.