Thanks for the opinions, everyone. This is my first major game project - to prove I could do it at all! The first few levels are basically tutorial, of course - later on things get more difficult, with added monsters and obstacles. His boss's head on the menu screen is supplying a little narrative to the proceedings.
Also: Went on another bug hunt and fixed a few things. Let me know if you find any more!
 "Leapy Louie Groundskeeper"){kind=icon}