Weird, I tried to turn off the music because it's such a small loop that it quickly becomes annoying, but even though the icon went off, the music is still playing.
I really enjoy this game! My only suggestion, and it's a technical one: there should be some way to limit the maximum volume of the samples played when firing a weapon. Playing 2 times the same audio sample causes it to be played twice as loud. Using a limiter in the audio engine should help this, I think :)
I don't understand what to do on the very first level: the first door is opened by shooting the pipes, and on the second I have to do something with the panel. Nothing I do, walking over, shooting it, pressing Action, nothing seems to activate it. I must be missing something?
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 "GunBall 2: Emperor Revenge"){kind=icon}
 "Raze 2"){kind=icon}
 "Coinbox Hero"){kind=icon}