Cute Creatures Couple Twist
http://www.newgrounds.com/portal/view/550648
The tactic that the legit players are using is to let the whole screen fill with monsters then clear it, and it should get you all three medals. You can use speedhack 0.1 to effectively pause it once it is full.
A loss is triggered like in Tetris where the block lands OUTSIDE the screen, so you can let it fill up to the top.