Devil's Due
I got this game as part of a Humble Bundle package, and I fired it up with the thought of playing for a few minutes just to see what it was like. A couple hours later I turned it off with a vague mixture of fondness and annoyance.
Unholy Heights is an apartment sim / tower defense game with some cute ideas and hideous difficulty spikes. It feels like a free-to-play game in that it forces you to "grind" out money for long periods of time in which you are essentially idle at the computer. A FTP game would offer the chance to shell out a few bucks to speed things up, but this game just makes you wait. Luckily you can speed up in-game time to make this process quicker.
The tower defense part is the weak link here, throwing repetetive, overpowered enemies at you very early on and wreaking severe consequences when you fail (but not a Game Over screen). But the apartment sim part is mostly enjoyable and offers some creative twists on the formula. One minor gripe is that your most powerful and happiest apartment dwellers will inevitably quit paying their rent while the more useless ones will keep paying right on schedule forever.
Bottom line: I'm glad the devs of Unholy Heights got their game out into the wild, as it were, and I'm glad they got a couple bucks from my Humble Bundle purchase. This isn't a triple A game, and I probably won't every play it again, but it provided some mild entertainment for a couple hours, and that's what a game is supposed to do.