level design
I really like the procedural generation, and the the level design is good. You could also implement jumping and obstacles to make it more interactive.
completeness and bugs
a bit chaotic camera movement
For example, at the start, when you use the right or left arrow, the camera moves way too far away from the ball and rotates. I think changing the camera behavior, for example putting it higher and making its movement independent on the bumbs in the terrain would go a long way. This would also solve the problem that the camera is sometimes inside the terrain, and observing the ball through it (I think it’s called culling or clipping).
finish screen
I think that when you finish the lap, there should appear a finish screen showing you the time and allowing you to restart, otherwise the player doesn’t know if they should continue.
typo
In the title of the game, there should be an apostrophe in the word LETS
overall feel
I like the game, although controlling the ball is a bit hard. I also like how you used procedural generation and the background image, making it look like it’s happening on the Moon.