it was pretty good, couple little glitches though
The game was kind of addictive, but i did notice one major glitch. If you go to the pause menu while enemies are on the board, your towers keep attacking even though the enemies stop moving. kind of an unfair advantage.
i felt also that the game was too easy, there was no real explanation of what happens when an enemy gets to your portal.
all in all, it was a fun little game, just needs some tweeks.