Lunistice, a 3D platformer with a 90s polygon graphics aesthetic.
Star of Providence, a roguelike twin stick shmup. Used to be known as Monolith until they changed it for copyright reasons, but the cool thing is that there used to be DLC, but it's now included with the game.
Ex-Zodiac: what if Nintendo actually made a good new Star Fox game? I think this one is a little too difficult, but it's still worth playing.
I'm going to recommend some lesser known games.