That was super short but so much fun. Like the progression spike from barely defending my castle to just obliterating all the enemies as they spawn was exhilarating. I think the toy castle was not as well drawn as the rest of the sprites but the art was generally well done. I really liked the teddy bears. The upgrade mechanics were a nice addition and really helped "complete" the game. If you could flesh that out, maybe add some obstacles and sophisticated path-finding for the troops and enemies (maybe look into using the A* algorithm?), I think you could get this published on a website like Armor Games.