Thanks for playing!
To use the jet pack you simply hold down jump :) You can use it for around 7 seconds before touching the ground, at which point you can use it again. I wanted to add a stamina bar for it but ran out of time :P
I also thought about throwing the character up with the tornados but never tried implementing it as I thought it would introduce too many bugs. In hindsight I should have gave it a go - you're the third person to mention them :)
Thanks heaps for playing through!