I beta tested this game.
Devotionalia is a shortish but replayable fantasy game that is all about atmosphere and contemplation. It is a choice-based game, but not immediately recognizable as Twine, due to the extreme customization: graphics, music, many variants of link types, and more.
The game comes with a helpful instruction page. Essentially, you are a priest of an ancient religion, the gods almost forgotten. You wish to learn from them, and thus you make your devotions.
There's not an action-driven story or a big cast of characters. It's a somber reflection on life. If you've ever seen the painting "The Monk by the Sea" by Caspar David Friedrich, this game is essentially the interactive fiction version of that painting.