I dunno which mushrooms collide and which dont.
I wish you'd leave some open areas into base and then complex/stiffy areas into center.
Also remember test map by your own, just running through map. The map doesn't look smooth. Though you are pretty far with map, you could modify some polys for smoothier play.
Still both gameplay and look seems good. It's gonna be nice asymmetric map! Let's try it at next playtest.