"Our Darker Purpose" is a stew composed of "Bind of Isaac"'s gameplay, a "Don't Starve" art style, and an atmosphere similar to Tim Burton's earlier movies. Whenever I start it up, I feel like I am playing an extension of "Coraline."
If you have played "Bind of Isaac," you will feel at home. If not, do not fret. This is an isometric roguelike game. You start off as a weak Cordy, throwing tiny fireballs at malformed students. You progress through levels, picking up items, until you either die and start over, or beat a chapter and repeat the process, having unlocked another section of the towering orphanage. By the end, you feel powerful, even though you will only have a maximum of two active attacks (your basic fireball and an on-use item).
This game is tough. Even if you are extremely skilled at dodging enemy attacks, you will likely fail or take a very long time to win. Your victory depends on getting the right item drops and the right upgrades, when you level up. However, there is a permanent upgrade system, where you spend credits earned after beating levels. Along with that, new items are unlocked, for accomplishing ingame achievements. This gives "Our Darker Purpose" heaps of replay value, and there is even a hard mode that can be unlocked, for those interested in an even bigger challenge.
There are some balance issues in the game, mainly with bosses. Some bosses feel like they have just the right amount of health, and others, mainly at the middle sections of the game, have way too much health and on-screen attacks *cough Time Keeper cough stationary plant boss that I cannot remember the name of* going on. If you get lucky with items, they are not too bad, but even then, these bosses will take quite some time to down. End-game enemies also take a lot of hits, depending on your build. By itself, this would not be an issue. These enemies, however, are usually jammed together in rooms full of hazards, causing some mild annoyance with the amount of kiting that has to be done.
The game is, as a whole, fantastic. The developers have given it several sizable updates, and it looks like it will get even more. It is very polished, with anti-crash measures put in place. It even has a borderless window mode (!!!). Help support these developers, and buy this game.