Brilliant design. The mechanics combine perfectly with the aesthetics. The learning curve feels perfect. I don't really like 'dead ends' in puzzle games, but since the levels where so short, they did not hurt here.
I cannot start any multiplayer attacks, because it allways says "you need to research at least XXX", even if the menu pops up, when I say attack, it suddenly needs more research again. Could you PLEASE make the Quick Match algorithm find only enemies I actually CAN attack?
 "Doodle Alive"){kind=icon}
 "Realm Grinder"){kind=icon}
 "Apple Worm"){kind=icon}
 "Bloons Monkey City"){kind=icon}