Mixing difficult platforming with some "brain-smashing" electronic music, Electronic Super Joy 2 from Michael Todd Games is releasing soon and like previous games it will support Linux.
Electronic Super Joy 2 is a brutally hard platformer, set in a world of brain-smashing electronic music. Run, jump, smash, & slice your way through 55+ weird & different levels, with giant monsters, swarming missiles & secret areas.
Enjoy 4 brutally difficult Boss Fights, including stealing Mega-Satan's Butt, earning Slime-Daddy's love & murdering Santa Claus (he's gone insane & is eating all the reindeer).

Direct Link
The trailer says it's "out now", but not quite.
Feature highlight:
- Play through 55+ pulse-pounding levels!
- Groove to 38 tracks of amazing music!
- Load your shotgun & fight through a DOOM-style FPS!
- Twist your way across the World Map, with 55+ levels, plus side challenges, secret levels, alternative pathways & collectibles.
- 8+ hours of gameplay!
- 4 HUGE Boss fights!
- Far too many dad jokes & bad puns!
Not played the first one? We have a review up from a contributor that's worth a look. Personally, I didn't get around to playing it until very recently. The story is absolutely ridiculous, about getting revenge for your Butt (yes really) but it's not a game you go into for the story. It's certainly tricky and the music really is quite intense, although I couldn't help but laugh at all the "Oh…yeah!" vocals. It's good though, if you've not tried the original and like intense platformers it's one to try for sure. I have emailed Michael Todd Games about a key, so hopefully I can do a proper look at the sequel after release.
You can wishlist and follow it on Steam. There's no exact release date being shown yet, but it will be "very soon".