Gee, I don't get to fight enemies with even the slightest bit of difficulty or intelligence for 15 hours!
Of course, when I can, I'll find that I'll have to play for weeks to fight them fairly.
Just because you can give a game the now cliche Kingdom Rush style doesn't mean it will automatically be good.
You have to spend more than an hour figuring out the game mechanics.
Final boss requires too much luck to beat.
Mainly luck that your allies don't die, because losing one ally means that the targeting spread will be concentrated enough that dodging goes from impossible to even more impossible. Also, you need every single one of your allies to hold off the army and get the shields down.
It's guaranteed faliure once you lose an ally, even if the boss is on 10% health.