That's great! I have been trying to find one for a while ^^! I would only need 1-2 tracks, with a distorted version of the main one for when the player goes underwater!!! I will upload an early version of the game tonight, so you can get a feel for it!
I would like a kind of synth-undertale-esque soundtrack(chiptune?), and the mood should be roughly reminiscent of hollow knight; but go with what you think sounds right!