Don't just rely on one tower type. Use a mix of tack shooters for high-density, snipers for range, and wizards for magic damage.
I notice you're looking for "TD5 unblocked" — this typically refers to (often a Bloons Tower Defense game, like BTD5), and "unblocked" usually means playing it on a network (like a school or work computer) where game sites are restricted. td5 unblocked