Pretty fun, great to put on while watching some TV.
Super worth the discount price, probably worth the full price.

Reading the reviews, I think many people are misunderstanding the game.
There isn't an unbeatable dragon, it's just a hard boss that you need to clear. There is one at the end of every stage and it sets the window for which you have to achieve certain things.
The AI isn't bad, its just based on their vision and speed. Increase vision and they will go after threats, or keep a few ranged DPS at home to defend.

All the tools are there.

OMG gud gud veri gud

I did followed advise from the other players to have range attacks at the tower even with the squid arm seems Overpowered, but when you get to the dragon he is too fast, and kills you undead too fast. I like the concept don't get me wrong. However, needing speed for your undead is annoying I know undead are slow, but it sucks. I am stuck at level one people are going to say "Well, you suck at gaming." but your undeads moves like freak snails and the upgrades are fine. It's the undeads and overpowered foes is the problem.