A very interesting concept that--if fleshed out more--could be a really fun game. Recommending on the promise of more content to come.
You drop blocks into a circle/donut thing representing a bar, with different types of blocks referring to different instruments or notes on a scale. The game then gives you positions for those notes to fill, and you've got to get them into that position through strategic dropping and queueing. There's a sort of rhythm-puzzle element to this, as well as a bit of freeform jamming.
Starting out I'm making stuff that just sounds cacophonic and plainly terrible, but I could definitely see myself getting better and finishing the levels with an actually good sounding bar of music! The build up and progression of the song creation is intriguing and quite fun to carry out.
It's currently extremely barebones with a default Unity-style menu and somewhat limited gameplay options. The trailer showed the backgrounds moving but I was surprised to see in game that they were static and quite aliased (with no options currently for anti-aliasing). Maybe there's an option I missed but I don't think I did. I don't think it's worth the $20 currently if you're looking for a product. I do think this is probably worth supporting on the idea alone because I haven't seen anything like it.