your game is working nice, here is my feedback...
- good art style, feels cozy
- art can be static but needs some movement: the player could tilt, coins could spin, clouds could hover, etc
- good initial difficulty but needs to introduce more variety and difficulty
- it would be fun if you sped up as you fall and the camera zoomed out a bit farther
- would be nice to be be able to use the mouse or touch controls to move
- needs more stuff to help sell downward movement, like particles of wind, or smaller fainter clouds in background
- it would be fun if you could reach the ground, like maybe it shows distance to the ground and you are trying to reach the ground as an objective, then it feels rewarding to player when they land, and can try harder levels where you start from higher up with more obstacles, maybe birds or planes
- needs music and sound. you can add sound easy with zzfx. maybe generate some music with ai.