Neon White was my suggestion as well. Ultrakill is fun but is going for a more Devil May Cry style game where score and style matter significantly.

Neon White i found a little confusing at first until I got the feel of it. Its a movement puzzle game, with some shooting. Precision and repetition are key to learning the levels and beating them quickly, and once you get into its groove, time flies by. For being a time-challenge game, I find it surprisingly relaxing and forgiving.