Mushroom Men is a (really nice-looking) 2.5D platformer set in a world that looks very big to a mushroom. Multiple characters are available: "heavy" characters with good melee combat skills, "sages" with excellent spore powers (special magic-type abilities) and "scouts" with ranged combat abilities. These characters will traverse 10 levels, each divided into two scenes, solving environmental puzzles and, well, collecting garbage. In fact, garbage is kind of important to the game.
The environmental puzzle we were shown involved using items found in the stage to reach a higher platform. The player had to knock a soda can into a buzzsaw, which turned the buzzsaw on, causing it to fall down. It could then be used to climb up to that platform.
As for the garbage: both the DS and Wii games feature the "scav" system, which allows you to pick up junk and combine it into weapons. And there are a lot of choices -- a quick look at the menu screen showed at least 20 available weapons. A 2D platformer with a lot of weapons? Yes. Yes.
I was very impressed overall with the demo, except for the part in which I didn't play the game. Luckily, Red Fly expects to release Rise of the Fungi late this year, with The Spore Wars to follow soon after. Hit the gallery for new screens and even more delightful concept art!
Gallery: Mushroom Men