Titan Shell is an in-development twin-stick shooter from Meatbag Studio that blends in features from roguelikes / rogue-lites to offer a pretty interesting experience not many such shooters give you.
Instead of being a linear shooter, it takes the randomized approach from other popular games to present you with a slightly different run each time you start a new game with the rooms, enemies, encounters and more being randomized to keep things interesting. Featuring fast-paced run and gun levels with a colourful set of core characters each with their own story, goals and some big boss battles. You'll also get online and local co-op and Native Linux support.
You can see the trailer below:
It's currently on Kickstarter with 26 days to go and they have over $45,000 of the $50,000 goal already hit so this seems like it will have no problem hitting 100% funding.
You can also follow on Steam.