I can't help but think "what's sigma balls". You did this on purpose didn't you..
The gameplay was nice and simple. Just blastin balls, what more can you ask for?
While jarring at first, I really liked the manual reloading mechanism, I feel like it added a lot to the game. The ball beings liked to get stuck behind things a lot I found, but that's a nitpick if anything, and it seems that was your intent from the start.
The difficulties of going to back-ups of back-up ideas is all too true, but you managed to pull it off. Nicely done man. Great job.