From GamesReviews:
"A few years back, PopCap released their mega hit title Plants vs Zombies. It definitely wasn’t the first in its genre, but it was one of the best. People have tried to replicate this formula to varying degrees of success. One company, Circle Entertainment, has done an admirable job with their latest title, Demon King Box for 3DS"
Circle Entertainment has lots of thoroughly underwhelming games on the Nintendo eShop and Demon King Box is yet another extremely mediocre title.
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While Demon King Box is simple to learn, it doesn’t do much to keep your attention for long. Perhaps that’s why they threw in the bath house level. This is definitely not a game for young kids. The price is reasonable at four bucks, but don't expect much out of it.