I'm not an RTS player, but it's pretty entertaining. Some units are very overpowered (like the green pixie in the easy map), but I assume that's part of the puzzle - trying to figure out how to overcome the enemy and not just make a murderball and throw it at the enemies.
The UI is readable, and surprisingly enough the music fits. Again, I can't rate it against other RTS since I'm not much of an RTS player, but it was an enjoyable experience. I like it, and the goofy mix of different kinds of sprites grows on you.
Can't exactly say that a witch king ordering a bunch of murderbots around is not entertaining!