Platformer Day 2.5: Aliens!

I’ve made a bit more progress and have added a little green alien which chases after the player, and is currently learning how to climb up walls (trickier than I thought it would be). The alien is more adorable than I was originally going for, but it’ll do for a start.
Next up:
- another type of alien
- a reasonable map to run around in
- better AI for the lil flesh eating beasties
