Thanks a lot for the feedback! 😄 You're absolutely right that you can get through a lot of the game by basically holding D and jumping. That was actually intentional to make simply reaching the end quite accessible.
The challenge is more in how you finish the level. Playing that way will usually leave you with very few coins, only one star, and you'll skip most of the new mechanics introduced along the way. A more competitive run means fighting against the inertia and the flow when necessary, entering the different routes, and trying to reach the higher paths where the stars are without dying in the process.
Your point about the rhythm side is fair too. It's definitely closer to a fast momentum platformer / endless runner than a traditional rhythm game — the “rhythm” is more about maintaining the flow of movement than following a beat.
Thanks again for playing and for the detailed feedback! I'll check out your game too :)