Chroma: a FPS - Music Game Hybrid that could never be (Patreon)

Harmonix’s existence has been closely tied to music and rhythm games and even after the hype surrounding Guitar Hero and Rock Band faded away, the developer kept experimenting with the concept of music applied to other genres. Given the massive popularity of the first person shooting genre, it must have been a quite logical leap to combine both concepts, giving birth to the initial idea of Chroma: https://www.unseen64.net/2016/11/29/chroma-harmonix-pc-alpha-cancelled/