Longer fight needed

This game was fun in the beginning, i even paid some money to buy a hero. But now its getting bored. Game finishes even before i get to use upgrade.

I wish i could fight longer and upgrade my units switch them relocate them move my heros here and there to support WITHIN A GAME. Each game is too short.

I might stop playing before i purchase a new hero if they dont come up with some sort of unlimited fight or something.

Wrikenow about Alien Creeps TD