Platformers - Celeste, Steamworld Dig 2, Shantae, Owlboy, Shovel Knight, Mighty Gunvolt Burst
Horror games - Outlast, Layers of Fear, and I personally think Perception is excellent
Hope that helps! ^_^
Racing Games - Fast RMX, Riptide Renegade (surprisingly high-content mobile port!)
RPG/Adventure - Mulaka, Blossom Tales, Golf Story, Nine Parchments
Stardew Valley is unique. It's veeeeery relaxing.