Like you said, there are bugs. Beyond that, towers should be upgradable and Nuclear weapons seem a little extreme. I was able to make it past wave 1000 by spamming "next wave" then nuking.... Also some more info on the towers, "powers" and energy would be nice!
No increase the frustration play with a five year old watching. You'll get helpful advise such as... "Daddy you die alot", "Daddy don't jump while under the blocks", and my favorite "Daddy, you have to jump harder!".........no honey I have no idea who taught the kid how to swear.
Awesome game hands down. Great weapons, great game play, great graphics. Alll around one of the best games I have seen!.....now the other shoe. I would love to see more challenge. It is very easy to level up and dominate. Gold medals are not a challenge at all. A challange would be killing everyone in half the rounds you have have enimies. There is DEFINATELY multiplayer possibilities here!