Not bad for your first game! I think my best feedback would be that controlling both WASD and arrow keys is difficult. If there was a key to press to enter jetpack mode and continue controlling with WASD, that would be helpful to the user. Cheers!
I put the arrow keys as the jet control because every time you are using a directions of the jet that direction is deactivate but when you touch the floor it s reactivate if you know what i mean
