I think my level was just bugged. there was a square missing, just completely empty. I couldn't complete it, and it was a fairly easy level (only 12) so I'm pretty sure I exhausted all of the combination in that area. left then right fixed it, though. Although I do have to resolve the level =P
"Doesn’t work on firefox. Got 1/5 for that flaw.
Seriously, that is unacceptable. Fix it."
Read: I'm dumb and it doesn't work for me so I'm going to give it a bad rating (that doesn't affect it anyway because of the other 21 thousand ratings).
aka, it works fine on firefox.
The only one I used special units on was the one with all flying monsters. I placed 3 mages for the first round, then the second I had enough for an archer and I used all archers from then on.
This is better than fancypants in a plethora of ways, but really it's rather difficult to compare one vs the other considering completely different genres. As for onslaught, I like this one better at first, but onslaught much more for replay value.