Unholy Heights, though well-crafted and humorous, is far from perfect. The combination of the two genres may seem like a fantastic idea on paper (and it does indeed lead to some enjoyable moments of gameplay), but there's far too much empty space for extended play sessions to be consistently fun. That said, it fills a hole left open for two of the most starved genres on the eShop, and fans of either tower defence or simulation could do far worse than to spend a few hours in the devil's shoes.

Unholy Heights is a blend of tower defense and management sim that doesn't over-complicate either element. Although some might wish the gameplay was deeper in certain places, there is a good seasoning of inner complexity that should keep many engaged. Add to that a charming, not-so-evil evil motif and some goofy (if not always the most grammatically correct) flavoured text, and it can be easy to get hooked - if you don't get frustrated by the spiking difficulty curve.

It is an incredibly charming resource simulator that is made to be played on a Nintendo 3DS. The controls are easy enough that anyone can start playing, but the gameplay will challenge everyone who tries it.