Play any type of Game at Y8.com. The biggest Game Collection to play free online. Flash, Unity 3D, Html5, Android, Java and Shockwave.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
If you like mixes of action and turret defense you should try the Voidgale Arenas.
W, A, S, D - Move.
Mouse - Aim / Shoot.
Shift Key - Place turrets.