Fly

Not really. Most use a single input against constant gravity - hold to rise, release to fall - so you're managing altitude rather than flying in any meaningful sense.

Crazy Jetpack. It is the cleanest version of the hold-to-rise mechanic, so you learn the rhythm before trying the ones that add complications.

Smaller, more frequent inputs. Most players hold too long, climb too high and then have a long way to fall, when a steady tapping rhythm keeps you much closer to the middle of the gap.

It combines flying with stacking, so what you have collected changes your shape and what you can fit through. Growth becomes a liability as well as a score.

Yes, all of them run free in your browser with nothing to install and no account needed before you start, and a run takes seconds rather than minutes.