FutureGrind

Future Grind is a hidden gem if you like platformers. What I love is your ability to be creative with the many path choices but you must choose quickly and execute immediately after deciding. It's very challenging and improves your mind's ability to think and act quickly.
The controls are simple: jump, double-jump, and rotate. You can hold jumps so they act like thrusters to continue pushing up. That's it but the rotating is incredibly precise. I fly r/c aircraft and you use the same fine motor skills when rotating with this game as you do flying r/c. That combined with the fast decision making and creativity in choosing your path makes this game incredibly challenging and rewarding when you succeed.
One of the ways you can tell it's great is how much fun you can have with just the second tutorial level. With just two alternating colored lines, you can jump forward and back. Hang below or push up. Fall onto each line without jumping. Land on your front, back or both wheels. In mid-air you might decide to thrust up instead of falling down to get to the next rail up higher. It's surprisingly fun just manipulating the little character exactly how you like.
It's runs the smooth-as-butter which makes it a pleasure to control and combined with the fine motor control of your vehicles rotation make this game way more fun than than you'd think just by looking at the graphics.

This is the sort of game that addictive if you like to complete things. It's taxing it's hard and difficult but super rewarding.
I find for me it's great fun to learn all the different mechanics and learn not how to use the different bikes but master them.
If you like a game with a unique play style this is the one for you.