Developer: playr.co.uk

Onslaught is a well thought out browser based tower defense. There are only 3 basic towers with 3 attributes each. (damage, range and rate of fire) However, you are able to build tower combos by placing groups of towers together and maxing out their damage. You also have upgrade towers that are very similar to what we are building in RPG Tower Defense.

The about us page explains possible tower combination specials as well as other useful information.

Not only do you have a ton of combination possibilities, the game features 8 maps each with their own high score list. I also feel that Onslaught TD is balanced quite well.

If you are a tower defense gamer give this one a shot. You wont be disappointed.