I agree with trigger happy
If you built some kind of money system into it, it would be fantastic. Gameplay is solid, and maybe you could put in some extra weapons or helpers like a missile launcher or a flamer. MAKE IT SO YOU HAVE TO BUY A SHIELD RECHARGE THAT GOES UP EVERY TIME! I made it to wave 70 somethin when i realized i had 6000 out of 6000 health! WTF? The shield is good but work on it. My other suggestion is special items you can only unlock by leveling up. Not everything! just a couple. Its a really fine idea, i like it better than a lot of other tank games out their. The graphics were pretty good, he enemy ideas were nice (up to wave 70) and the sound effects were okay. O! last suggestion. For more replayability, maybe make 3 different classes, like a machine gunner, a balanced, and a heavy weaponer. That would up the replayability value a TON and you'd get a lot more views. Sorry about the extremely long comment, this game just caught my attention. 4/5