Been enjoying the hell out of Nidhogg recently. Some other notable ones are Mark of the Ninja and Bastion (maybe? I don't know if you're counting 2.5d games. included it because its absolutely, stunningly, beautiful. seriously worth looking in to)
Nidhogg is amazing :)
My goto answer for addicting 2d game is Binding of Isaac.
I own a bunch of retro consoles and games, pretty much all by Nintendo and have always wondered if there's an interest in "let's play" of an original Legend of Zelda and so forth (I'd guess most are done via emulator but that just doesn't feel right to me :P).
Would require buying a hardware capture device that's Linux compatible but those are 1in the 50-200 Euro range. I'm feeling like it would be something I'd have a blast with but not sure.
