Nuns With Guns In Space ($5)
Nuns with Guns in Space is about power armoured nuns hunting demons. The action focuses on investigating supernatural incursions and blasting them with holy fire. Your abilities are powered by guilty feelings which you try to expunge through confession and atonement.
Note: this is an inherently silly game to be played with a sense of grimdark seriousness. Not about playing through actual religious stuff.