I found this game to be quite difficult kek. As Donpommelo mentioned it would be helpful to have some sort of indicator of whether or not it is safe to land. There were several times I thought I was moving slow enough to land and was quite mistaken.
I assume you intend to add some sort of terrain that is more than a white line so I won't say too much on that, my only real gripe about the scenery is it is easy to get lost when you lose sight of the ground/buildings. the first time I came to a large drop I wondered if I had gone off the edge of the world. Then suddenly, BOOM, smack the earth.
Personally I wish there was a way to rotate faster sometimes. Perhaps the mouse could be used to rotate somehow? thus giving the player finer control.
As I said it is a difficult game (at least for me), but it is satisfying when you start to get it.
++Shoutout to fellow SDL chad!