Celeste is great. I'd second that recommendation highly and throw in Hollow Knight as well. I've got almost 100 hours in it and watched less than 5 minutes worth of cutscenes or exposition. It's just pure gameplay and the difficulty gets pretty unreal. There's a ton of other great indies out there with the same, turn it on and play. I'd given on gaming for a while. These new ones have gotten me to enjoy it again.

In that same category of pure gameplay, I would also add Enter the Gungeon, it is difficult, and Its curve of skill improvement vs playtime is too shallow, I mean, it takes a lot of playtime to get better at it.