Awesomenauts

Awesomenauts is a game about strategy and teamwork.
It is a 2d side scroller game based around the idea of the MOBA – multiplayer online battle arena.
Two teams of 3 battle against each other in their efforts to destroy the enemy minions, towers and ultimately their base.
There are many characters in the game, ranging from stealth assassins, support healers, long range snipers, high health pool tanks and defensive shooting sapling layers! More and more characters are unlocked the more you play, so as to not overwhelm the player with a large selection of heroes at the beginning of the game.

This game was a part of the recent Humble Bundle 8, but in case you missed it, it is available on steam for a price of $10.