Solid TD.
Even though personally I am not a fan of this particular style of TD game admittedly it's still pretty solid. Pretty nice visuals and after half an hour of playing everything seems to be balanced fairly well.
Personally I just find that it's a hassle always looking up the recipes for the towers that I prefer even though I'm sure a dedicated player would memorize them eventually.
The levels also drag on forever with little variation so it's easy to get bored.
Still, it's not bad. I encourage you to try it out for yourself to see if you like it. Great for killing some time.