Physicsy jetpacking in a colourful little world with funky music. It's mad fun and sometimes maddeningly annoying with its unpredictable physics. But, with a bit of practice it's actually possible to control it rather well. I just hope the developers take it further, as it could be improved in many ways, yet I haven't had this much fun with a jetpack since Pilotwings 64, I guess!
It's free here:
http://ragesquid.itch.io/radical-rockitsAs a bit of advice, don't bother with trying to get the hang of using just one thruster for turning, I find it too difficult before even being able to fly in a straight line.
Also, for some reason turning left and right is inverted while the thruster are off. Took me quite a while to notice that.