I wrote a post about this game earlier. I just played it some more and took a few printscreens, so here they are for the world to see. Just about every wave (level) in the game up until level 32 is shown here, along with all kinds of foes and power-ups. After level 30 the game really gets annoying, even on normal mode. Then there's difficult and insane, just imagine how that would be?! Anyhow, great game, great time waster. After each five levels a checkpoint is formed so you can skip back into the game from that level (though your score is reset) if you lose. Each tenth level is some kind of boss level, and each level after is just a collect-bonus-points-within-time-limit level. Music builds up overtime, as do enemies and power-ups. I didn't complete the game, no time now, but I guess there are about a hundred levels in it (judging by the leftover space on the checkpoint page), so there's plenty of gameplay! Anyhow, pictures below.