BitmapTD is a pretty basic looking towerdefence game with sprites with some classic game monsters as bad guys. This game seems to be based on Element TD 2 with a camera that can follow the creeps.

Defend your girlfriend against lines of creeps, game from Addicting Games. Looks really good. Towers with a nice range too.

Defend against waves of rolling bad guys. Build towers from blocks and upgrade them to bring down the enemies.

Defend your base in a war zone against tanks and planes. A few towers that are all very powerful, one level that's easy to defend.

A science-fiction defense game from Packed. Build large turrets to shoot down the enemies in this beautiful game.

A Onslaught 1st version money hack. Makes the game really easy and possible to get up to extremely high waves. You start with $1.000.000