Not a bad little game. Really liked the colorful character designs. The coin multiplier the further along you progressed was a nice touch. A little too grindy at the beginning, though.
Started as a nice fun little game. Fun graphics, and interesting upgrades. Would have prefered if higher shotgun levels unlocked tougher enemies, rather than all the enemies getting stronger. Like some already said, if by upgrading the damage you can no longer one shot an enemy that you could with a lower damage score, than why upgrade. By making new enemies come out, then the difficulty goes up along with the rewards.
Plus learning how many hits to kill which enemy goes out the window when it changes to more hits because of an upgrade.
 "Family Rush"){kind=icon}
 "Shotgun vs Zombies"){kind=icon}
 "Rebuild"){kind=icon}
 "Ragdoll Invaders"){kind=icon}
 "Evenator"){kind=icon}
 "Snowman Attack"){kind=icon}