Thanks for the spread.
The flight control is fine, it is more a matter of adaptation. The demon's jump is sensitive, you can jump low or high depending on the intensity of how you press Q, just as if you press it twice the demon will fly at ground level or higher depending on how fast you press it once it jump:
If you jump high and the ceiling damages you, then the second time you jump lower or activate the faster flight to avoid crashing. It is not a game to play a quick first game, since to play it requires good control of the demon. Once controlled, this first phase of the game can be passed without receiving a single hit.
Afterwards, the game is no longer as intense. You could say that this entire first part is jump and flight training. However, an easy version will probably be uploaded, also more friendly at the beginning, for less skilled players.