Append M-Paradise
Armor Games has another productivity enhancer called Momentum Missile Mayhem 2 - (Ultimate Edition) (spelling corrected by me). This one plays kinda like your tower defenses, but instead of building towers you have to use an energy slingshot to smash enemies into each other. Note that the enemies keep coming while you have the Upgrade menu open, so you probably want to wait until after the level completes to handle that. Also, when you die, the game resets your cannon position to the left. You need to watch carefully for direction changes anyway, but remember to check when you have to restart the level. For that matter, after you save the game, hit Cancel and double-check the direction.