Shipwrecked. Captured. Betrayed. Forced to perform for an audience of cats? Yes, all that and more when you unlock BattleBlock Theater! This game just sounds funny!
KeeperRL is a Dungeon Keeper and Dwarf Fortress inspired dungeon simulator built on top of roguelike mechanics. You become a Sauron-like character, searching for ultimate knowledge of destruction.
Skyward Collapse is a pretty interesting looking god-game from Arcen Games who have become Linux-friendly developers recently, they have stated Skyward Collapse will come to Linux.
You have ~20 days to vote for your favourite project of the month for May. The projects are open source engines for commercial games/commercial content.
A mature, story-oriented adventure game with a unique style. Currently seeking funds on Kickstarter. They've just announced Linux support as standard, rather than as a stretch goal as originally planned.
Depths of Peril is a single player action RPG with strong strategy elements. You play as a faction leader protecting the barbarian city, Jorvik, by destroying threatening monsters and completing quests.