I'll start us out. I'm currently working on a fangame called "Project: TRE". (It's a working title...)

Project: TRE is a fangame for the BIT.TRIP series of games, specifically it's... basically my take on the BIT.TRIP RUNNER subseries of games. If you don't know what that means, then basically, at it's core, it's a rhythm-based autorunning platformer game (Kinda like Geometry Dash... but before Geometry Dash). Running, jumping, it's... it's easy to learn, hard to master. (The actual game is like, really freaking hard.) Running into anything sends you back to the start of the level (or in the case of Runner2 onwards, to the last checkpoint you crossed). Stages aren't too long, usually, and as you go through them, the music evolves. It's easier to see what I'm talking about if you just played the original games (or watched a video on it.)

Anyways... Here's the current progress for the fangame... (youtube link) I literally just got done with creating a level editor. Or, rather, a prototype for an internal level editor so I can make stages for the game. The game's not even CLOSE to completion. But, for now, I hope you like what I've got so far.