So.. people remember that gigantic "click + drag" comic? Well someone turned it into a "game" -- used your cursor arrows to navigate and space bar to "jump/fly"
http://xkcd.kajakklubben.org/
PS: You can also teleport around, but it takes away some of the sense of "exploring" -- although falling from the high towers or holes is very cool, takes too long to fly up there normally..
Shift + T, then any of the numbers below:
UFO: 0
Ship Under Bridge: 1
Huge Tower: 2
Flying Rocket: 3
Whale: 4
Rocket: 5
Rocket (Repeat?): 6
Cave1: 7
Cave Fighter: 8
Cave Place: 9