I remember making a dota precursor game on Warcraft 3 after playing some tower defense games... I created waves of enemies spawning in opposite directions, but

I remember making a dota precursor game on Warcraft 3 after playing some tower defense games... I created waves of enemies spawning in opposite directions, but you had 2 teams trying to build towers. The problem I had was that once spawned, building lots of towers messed up the patching. I abandoned the game after only a couple if tests, but I think it has been original at the time.