Ridiculously predictable. I won't say any more just so I don't spoil it for people who somehow didn't get it, but please, for the love of god, be a little bit more original.
The game is riddled with grammatical errors, the main character looks like a mediocre rip off of Goku, animation is weak at best, and gameplay is extremely unbalanced (as I've said before, I 1 hit everything up to level 69 in the tournament using dark transformation, boost, and blast. I was level 22 at the time). I'll give you a 3/5 because it remains somewhat amusing despite these flaws.
Each level after about 6 just takes waaay too long to complete. Not to mention the lagged pixels that continue to fall after going clean through your tree.
Ridiculously easy. If you just pump up strength, defense and reproduction, you can't lose. Maybe it would be harder if you started out with fewer units than your opponents.
Units retreat constantly with no explanation as to why. Also, it seems as if only the closest unit can attack, or something. Frequently this is a weak unit that I'm trying to pull back. It gets attacked like 3 times and then I lose because the zombies teleported halfway across the map and my useful units couldn't do anything about it.
The repair drone ai is very weak. They all go straight for the most damaged structure instead of spreading out or whatever. Maybe give us the ability to set certain drones to a 'zone' that they work in so that your turrets all heal equally.