An awesome variation on the common Chain-Reaction games! :) I remember I didn't like the original 10 Bullets much, probably because it's too basic and therefore repetitive. The upgrades in this one, as well as the various ships and bonuses, certainly make it much more interesting - and addictive, I should've already gone to sleep...
I was a bit disappointed that the Buy Another Bullet option turned out to be just for continuing the current game, which felt kinda pointless (unless you chase top score indeed); also, I personally disliked the full-white-screen explosions during which I couldn't see what's going on. Otherwise - well, there are many possible upgrades and extensions to this simple game, but they'll hopefully arrive in 10 Additional Bullets or whatever you'll call it :)