Thanks, I actually already bought pico-8 and Voxatron anyway. Sphere Buster is fun. I'll see if I can make something fun myself...
Correct me if I'm wrong but it looks like we will need to purchase Pico-8 to run this game, yes? Voxatron looks pretty interesting too =)
Addendum - I just picked up both of them, I may see what I can make myself thanks to your inspiration. =)