It’s on kongregate. It’s multiplayer. It has pixel graphics. It’s 2D. You had to jump through bricks and jump pads and stuff in the levels. There’s a level-maker. You can play other players’ levels.
Completing a level, based on difficulty, gave you XP to level up. As you leveled up you unlocked better avatars.
If you’ve ever player shell shock live, one of the weapons is EE bomb. The icon/bomb image of it is one of the avatars you could have been. If don’t know what an EE bomb is, it’s basically a yellow smily face, with the eyes looking upwards and a grin.
I haven’t played it for a year+ so I can’t remember the name. If you know the name, please tell me.
EDIT: I found it! It was called Everybody Edits.