Thanks for your feedback :)
I thought about the genre I wanted to make my game in, took the first three ideas, that came into my head and decided not to make something like this, because I wanted to create something, that maybe has not been done yet with 1 button controls. My first ideas were: flappy birds, some kind of rhythm game and auto runner, where you click to jump and hold to slide. Then I had the idea with this sort of dungeon crawler like game and stuck with it, because I have never seen something like this.
In general, I still like the idea, and I had on my to-do list to add three little icons on the bottom right of the screen which represent the three actions (turn left, move (or attack, if facing an enemy), turn right). That would have helped maybe a bit - especially at the beginning.
I am not quite sure, if I will continue on this game, I have some ideas how I can improve it (thanks to the feedback) and it would be a good practice. So yeah, maybe :)