Our currently undergoing project is called "Super Rocket Shootout" (former working title being "A jetpack and a shotgun"): it's a local multiplayer brawler full of jetpacks and shotguns (hence the former working title) for Mac/PC/Linux and maybe Xbox (360/One).
We're currently developing a prototype that will soon be considered as pre-alpha. Here's some (already quite old) screenshot of the game :
Next post will tell you more about the mechanics and the influences!
Stay tuned!