Cluster is an abstract tower defense with an hexagonal map and an innovative progression system. Emphasis is placed on the art aspect with appealing visual effects and music.
This screenshot features several hundreds of ennemies at screen simultaneously. It's a stress test used to check the framerate will not drop during the most intense moments of the game. And as you can see it's pretty good. :)
FYI the screenshot was taken on a MacBook Pro 13-inch, Intel I5 2.5Ghz, no dedicated GPU : Apple.com