Bug fixes!!

I fixed a few bugs (well more than I want to write about here). It's still a work in progress. I tried to make it more clear when a level ends what your next goal will be (e.g. "save all" or "kill all"). The groundwork for co-op is mostly done and will be in the next update this spring along with a proper game loop with at least one boss. Yes, you will FINALLY be able to die in the next update. I've been slacking on that because I don't know how much health to give players and what the consequences of dying will be...yet.....