Oniken came out last week on the PC. Yeah, you read that right. The PC. Not the NES, not the Master System, a personal computer, in the year 2012.
So thorough is the developer's homage to the 1980s, though, and in particular Japanese side-scrollers, that I needed to actually point that out.
Whenever someone makes a "demake", others often complain that it's a waste, that all that art and music and programming could have gone into developing an original retro game instead of a tribute to an existing property. Well, here you go, complainers. This one's 100% original, and has a 100% amazing soundtrack to boot.