there are only a few things that would make this..
game over the top for me.
1. medals: you beat the game, bought every monster part, bronze/silver/gold on all levels. even a few secret medals for odd combos of monsters.
2. as pointed out before, the aiming could use a small tweak. example: the laser, when you fired and drug it, some of the flying targets would just slide through.
3. the freeze ball when in the bug's body could not reach the higher planes, making the range of motion on the head a little bigger would solve this issue.
4. skull collection. one of the perks could have been to increase the range in which you collect the skulls. also, with tall buildings, you do not see the skulls till 1/2 way up or greater. this makes it a little harder when charging over victims in the streets below.
on the positive side, things i did like about the game:
1. the freeze effects, watching as my flying victims came crashing into the ground.
2. the airplane impact reaction. killing more people instead of just exploding. nice touch.
3. the different movement styles gave the monster a more life like feel.
all in all, good game. a few tweaks to the next game would make this a home run!