Learn to Fly ! Strangely Addicting...
A really great game. Unlike a lot of distance games that I've played, this one actually lets you stay engaged. As opposed to just timing something at one point in the jump, or getting lucky throughout, this game actually requires you to stay aware for the entire jump to maximize your score.
You've made a great game here, never quite made it to 6,000ft. But I'll take 5,000ft and be happy with that.
As far as improvements go, perhaps if you decide to make a sequal you could just include more upgrades of rockets and gliders. Perhaps add variables to the mix with updrafts, flying against the winds on occasion, etc. Not too sure what you could add to the game, but hopefully that will get the gears turning, as I'm sure you'll probably come up with something much more innovative.