If you've got a nice idea but need some (help with) music / sound design, let's see if we can create something cool together! I have some coding experience in C++ and Javascript - made a little node.js game - but my focus will be on creating the music and brainstorming about the game itself. In my music productions I often use varispeed (speeding up/down) to get different timbres. I made a tool to figure out how much I have to change the tempo in order to change the track to a specific musical interval: https://bentlangerak.com/varispeed.html

The track Math Freq is based upon the relationship between tempo and frequency. The pitches of the main synth are the result of placing many pulses in specific intervals related to the tempo: https://soundcloud.com/bent-langerak/beats-for-neats-math-freq?in=bent-langerak/...

These techniques do not have to be the basis for the game, but it's more to show you in what ways I like to nerd about with audio :)

One example of a rhythmic game i like is 140. Especially for how well the music is integrated into the gameplay. If you care to know a bit more about me and my work you can check these out:

https://bentlangerak.com/listen.html

https://soundcloud.com/bent-langerak/sets/composed-by-bent-langerak

Feel free to contact me if you are interested or have further questions!