I am just going to add my complaint because I have invested 3 hours into this to no avail. I am tired and I give up. I am not griping about how difficult it is, but the fact that I already beat the Level 2, 3 and 4 challenges but did not receive any Big o' Cosmos due to some bug.
Completed the level challenge, died, waited and saw screen with an error message. No big deal, I thought, I'll play again. Same thing over and over. Tried IE instead of usual Firefox. Same thing. This happened until it hit the level 5 challenge and the game wouldn't load at all. Started again @ this level and 2 hours later I have nothing.
I guess I have to resign myself to the reality that I do not have the diligence to ever attain a Big o' Cosmos (even though I did). This is the first time woot has disappointed me. "Big o' Cosmos." now means "Blow Off Curtis", or more broadly "Blow Off Customers". Goodlater.