Bucho mentioned the dice- I'd like to see more aggression with dice combinations. We are too far in this game for this to actually happen, but...
Red+green? Yellow+yellow? I like the H&M monsters, but if this idea had been explored beyond just the (well-designed I think) rat swarms, I think monsters would be more distinct rather than some of them (flesh moulders/dark priests cough cough) being different flavors of each other.
Edited by Lightningclaw