I've uploaded a new Loose Pixels demo to Kongregate, this demo only has one level, and is closer to a regular tower defense map, than the others. There's 40 wave, and all the defenders and towers are available.
The only major feature missing are the upgrades, but I still feel, that I need to change the graphics and balance the towers.
The main feature of the game is, that Loose Pixels (and hopefully the other TD games, I'll build on the basis of this project) give the player a lot to do during waves too, as potions, magic and also defenders could be created when playing, and that some attackers come in real 3d (some flying units).
You can try the game here: