This guy had also made Droid Assault. Explains why the explosions are the same... And also, with his response to kurtcobainnrvana, it seems like he's too lazy to add a useful AI, or even add suggestions.
Health packs are used when you run out of health. Also, the game can't have badges, because it doesn't have API. If it had high scores, it would have API. It doesn't have high scores.
"Attention! Highly explosive structures!" -shoots before reading more- "Explosion has a huge effect on a large area! Use only in extreme cases!" -hits menu, restart, and yes-