Oh~? Great! War of the Monsters is the only game I know that had people in it that you can squish between your monster's feet or from your monster's attacks. That game, even though it is a ps2 game, still is my top most favorite monster game of all time. Although not sure if that is nostalgia talking :P
I am not sure how much you would be willing add to "finalize" the game, but 2d or super simple 3d people would be nice along with more details for overall destruction. The game also feels very easy too, I am unsure what you can add to make things harder. Maybe a option to adjust how many military units spawns would help with difficulty? Or something? Or new enemy types! Or maybe... powerful turrets or something?
In any case, I'll definitely play this game again once everything is finished and done for your game here!