With the recent update and the UI feedbacks I finally feel like the master of my creation!
It is a super nice platform to make cool music. It's hard to make a sampler in which every combination sounds good, but I feel like it's the case here! And that's no random chance, all thanks to your ear, taste and skills!
For a game, it is still missing some kind of objective or quantification. Here's an idea using this "tech": limit the user to an arbitrary amount of points: turning an source on will use X points (it could vary depending on source type) and firing one shots will use points each time. The user is limited to this amount of point to make a music which he records and uploads on a page. The best voted music wins. Even with limited time you can make this happen by writing down instructions and letting people chose their own recording and upload means. An itch.io jam page could have been used to collect and rate the entries.
In any case, this is still very nice both alone or together through a stream or video. (Music is meant to be shared!)
I hope this helps, thanks for the UI update and see you at the next jam! Take care!