As others have said, after you've killed all the enemies, the blue guy is nearly useless except for scouting out the rest of the level.
I kind of wish there was a timer on screen of the random time left so I could move some of the characters out of the way. I had a couple times where the next part of the objective was through a door or hallway that I accidentally blocked with the previous character because it switched right as I was moving into the smaller area.
I like the ideas here, could use a bit of polish to make blue a bit more useful.
Also, just having to pick the correct flower on the level full of them is really annoying.