Bounty Battle looks extremely fun, with a cast taken from other popular indie games and it's now been fully funded on Fig. They also announced some new character's coming.
River City Ransom: Underground released for Linux originally in February, sadly the developer said they would send over a review key and never did. Now it's available on GOG so I've had a chance to take a look.
After the disappearance of Linux system requirements on their Steam store page, a reader reached out for us to find out what was going on with their release plans.
The game, as of the day this article was written, holds "overwhelmingly positive" reviews on Steam, so you may want to give it a chance and spend at least a few minutes playing it. You don't have to pay anything, you simply download it (only 8 MB) and load it in mere seconds. It's very easy to learn but a bit tricky to master.