Retro Groupees, a bundle of games available on multiple platforms, contains a couple of Linux titles, Foreline and Anodyne.
The game bundles sold through Groupees are not well known, but they do have some pretty interesting games and, sometimes, a few of them are Linux-compatible.
Forceline is a 2D action platformer in which the player has to control the prince of Athretia. The prince’s quest is to rescue the princess from the evil viscount and his minions.
Anodyne is also a 2D game, but the gameplay is somewhat more complex. The player will move from one room to another (160x160 pixels in size) and fight various monsters.
The minimum price you need to pay in order to get these two Linux games is $3 (€2.34). More details about this bundle and the other games included in the collection can be found on the official website.