Hmmm, I've tried it on multiple computers (and the analytics say that a bunch of other people have also played the html5 version) so I don't know what the issue is. If you hover over the game your cursor disappears but you should still be able to click on it and take control!
Glad you got it working. I double checked the windows version and that worked fine for me as well as the online version.
Here are the controls:
Hold shift for a couple seconds to put the throttle at full (control reduces the throttle but you don't normally need that), then use S/W to control up/down, A/D to control tilting left/right, and Q/E to control rudder left/right. Press C if you want to toggle camera modes, and press R or T if you get stuck. Press H to toggle the help menu. That should be about it!