20 Waves - A new take on the Tower Defence genre and it's FREE
Although I'm not a fan of Tower Defence games (it's not my style), 20 Waves by Colin Lane does change the genre slightly and offers a lot of fun in a freely playable browser based game. But what makes this game so different from the others? Well factor in that it's not top down and it's 2D based, but turrets, force fields, and walls need to be placed against the oncoming waves from the sides to defend your mining operation. It's that simple!
All in all It's a fun game and a great time waster, especially as you mine for resources and partially fund the defence operation all the while listening to a cool chippy soundtrack.