There are any number of other things that I could do with my time, but I've decided to compete in PyWeek, a competition (of sorts) to make games in a week.
I've already got 4 levels of gameplay working, and it's time to break for lunch. I'll post again here when I've prepared something that people can download (and if you're at all interested, please download and try the game - it'll help me know if it works on other machines, and if my documentation's poor, and so forth).
