Leszek Godlewski the master-mind behind the Deadfall Adventure and Painkiller: Hell & Damnation Linux ports has made a post that should help people building their games for Linux.
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.