When there are a ton of enemies on the screen, the game lags so badly when you try to place a tower (since it's recalculating pathfinding for everyone), that the enemies jump forward and in most cases you can't even place the tower in that spot anymore since the enemies lagged into that square.
 "Bubble Tanks Tower Defense 2"){kind=icon}
 "Huje Tower"){kind=icon}
 "Epic Coaster"){kind=icon}
 "PixEvo - The Fountain"){kind=icon}
 "Pandemic 2"){kind=icon}
 "GeoSketch"){kind=icon}
 "Damn Birds"){kind=icon}
 "Heavy Weapons"){kind=icon}
 "Bango!"){kind=icon}