Air buoys supply a Soundmarine with finite music snippets. Keep picking them to layer the sounds.
Don't bump anything else on your way.
Controls — Arrows or WASD. Esc for pause.
Made for Ludum Dare 45.
Update 2019-10-09: Fixed rendering on Windows and Linux. Minor visual and gameplay polish. You can still play the compo version at LDJam website — Here.