If you choose not to watch the video (as I imagine many, many won't) I'll warn you: the difficulty curve for the demo quest, because it is so short, is rather steep. Best of luck to you >:D
For those who miss the 'controls' page:
Z/C pair or X/V will Jump/Harpoon (throw or recall).
Arrows move and provide an alternative jump control.
---> I forgot to mention this earlier (or anywhere, really) but R will reset the level!
Also, press P to complete the Controls screen on the last page. (even though it says it -right there-)
That's it! I hope uploading demos is allowed. The full version is complete but I'm working on finding the best sponsor that I can. Thanks for understanding.
Find your harpoon, and throw it.
Ride it through the air, because you are FISHBANE, and you are AWESOME.