Screen is too small.
i was going to write a review... but my feeling on this game are perfectly portrayed on redwolf7x's review... so... there it goes... X)
I really REALLY want to like this game...
As far as concept goes, 5/5. Graphics 5/5 as well. I see mutant plants taking over cities, my heart fills with absolute joy. The ominous doom music is charming as well (If not repetitive). Now the bad part. The main problem is the game is very buggy, with glitches making you unable to finish waves, or losing control of units, makes it frustrating. Controls, while simple, could definitely benefit from some polishing. Pair all those with an insane difficulty spike around level 12, and I had to call it quits. :(
I'm noticing that I'm not alone in thinking you have an interesting concept on your hands, but that the interface is lacking. Some keyboard interface would be nice, or at least making the gestures smoother.