Yeah, that would be cool. You could play the survivor modes pretty efficent and all vs all on a tablet maybe with a change in the interface. Playing CreepTD from everywhere. There must be a solid internetconnection though.
Apparantly there is no further development at the game atm, so we can only hope and play on PC or Mac.
How would you fit this 16x16 grid, possibly 32x32 grid, on a phone screen. Additionally, the creeps and tower menu. It would be so small, you had no way to tap the intended spot with your finger.