not worth it for one reason: Tose
Tose developed it and Tose is Japanese for Acclaim. Their work is very lazy and inferior and you can see that in abundance with Crystal Defenders. Its very slapdash. Feels, looks, and plays like a flash game you'd find on newgrounds actually.
I bought it when it was on sale during E3 (half off) and its definately not worth it if it costs 800 msp. If you like tower defense games, I'd recommend the game Crystal Defenders is probably ripping off: Defense Grid.
gamer tag: Archer Spense
no random friend requests accepted.