Thanks for the feedback. I will add a tutorial for the control ingame.
At first you could move the character in the air. However, it made the game very easy, because you always quickly get to a wall due to the resolution. So I decided to go with the variant with the dash. My goal was to develop an easy-to-learn-hard-to-master-game. Well and of course my experience in programming is also very limited :D
Thank you for taking the time :)