Been going through some fun ball games recently. Was always a fan of the simple joy of playing as a ball. Something about using physics to get through an obstacle course is just appealing.
Beat Super Monkey Ball on Expert, but didn't make it through the Master levels. That shit's fucked up. Played through the story mode in SMB2.
Replayed Within a Deep Forest for the first time in like 10 years and it holds up pretty well for a freeware game from 2006. Playing through Knytt Underground as it is at least half ball game.

As for new titles, Exo One and Crumble are both modern ball games more build around speed, which is fun. Both are very short, but I liked them.
Exo One was a very comfy, pretty game that let you go at some insane speeds.
Crumble was lighthearted and more challenging, but seems the speed cap is far lower, which is a shame. More involved platforming though.