Marshmellow Maniac - a source mod idea

You play as a dude who loves marshmallows. You have to collect the floating marshmallows in a colorful crazy world. Everything from jumping from a fantasy miniature train to another to leaping giant gorges to get as many marshmallows as possible and getting to the end before the time runs out.
There’s also versus where 4 players try to collect as many marshmallows as possible in a set timeframe.
The world has to look weird. A mix of TF2 style and an M&M color usage should do the job.

I have many more ideas, but I'll wait with posting them.
I just grew tired of typing.
I had a brainstorm with ideas you see. No, go away Hailstorm and Braincabinet. Shoo! Shoo!