I liked the visuals of the background, and the foreground sprites were probably fine, but it did feel a little odd having a very detailed background and more pixelated foreground sprites. I feel like having sound would have improved the experience.
I felt that the controls were a bit floaty.
The pause button on the upper right is bugged. If you press it, it will continue pausing/unpausing in intervals. Also, coins continue scrolling, and the player character continues animating while paused. Also, things keep scrolling after you die.
As I've said on some others, regarding accessibility this game would be fully mobile friendly if you had also accepted the mouse button as input.
Gameplay wise it was good. Had two types of obstacles, coins, and score (though not saved between sessions.)