I've been making a list of such games that I think are "hidden gems", I hope you enjoy playing these yes - Collection by colamonk
Also this is my submission, its hidden but not a gem by any means, nevertheless I'd love to have your thoughts on it DIAO by colamonk

My physics ragdoll platformer:
You control the Messenger of Death and must fight wave after wave of enemies, you can make your journey easier by collecting their souls, which you can use to buy upgrades, such as more attack speed, a better jump, higher critical hit chance and many others. However, you must sacrifice your life to get these upgrades, you'll start from the beginning if you do this, but your upgrades will remain in your next life, giving you a better chance to deal with the waves of enemies.



Hi