@Dariush: It's not that the game is slow, it's your computer that's taking too long. At least play the game because in my opinion, it's one of the best games on Kongregate. Besides, why would you want to mute it? The music is freaking EPIC!!!
I'm sorry to be that one jerk on the internet, but I never found myself stuck on anything for more than 3 or 4 lives (and yes I was playing on insane).
To anyone and everyone suggesting multiplayer: save your breath. AddisoR and JuiceTin have confirmed that multiplayer will be in Raze 3. They WILL NOT add it as a patch to Raze 2.