I get that this is an attempt to blend the SAS series with their Bloons series, but the execution is mediocre. First of all, the towers are too expensive for your in-game income. Not to mention that all towers can be knocked out of commission, but some towers such as the sandbag, are permanently destroyed once they took enough damage. Also, why cant you put some sort of a sniper on a rooftop?
-E135- about SAS: Zombie Assault TD