OMG it does work! I switched to IE and the combos work!! Everyone having trouble with the controls try using IE (I'm using v. 6.0.29). On Firefox (v3.0.7) the combos hardly ever worked.
I like this game but the combos are shit (no matter which side of the screen) and the AI is WAY too fast, they make combos in succession that no human could possibly hit (this is because you have to lift each key fully before pushing the next key in the combo). And the AI doesn't move at all while executing combos like we humans have to do, it just comes out instantly. Also the block almost never actually blocks and the Jesus AI blocks 90% of my attacks instantly.
This tower defense has an inherent flaw in the gameplay. If your towers are barely not strong enough to kill the creeps and they get by with 1hp each, then the entire stream of creeps will subtract their damage points from you health. It's too bad, I really like it otherwise. I think I'll stick with Gem Craft. . .