The keyboard keys for the piano should be remapped to make it actually playable.
Playing black keys using Alt is not feasible.
Left shift would be lower octave
Right shift can be higher octave
Space key be for playing with sustaine
Like the following:
A W S E D F T G Y H U J K O L P ; '
- A Tonic
- W Minor 2nd
- S Major 2nd
- E Minor 3rd
- D Major 3rd
- F Perfect 4th
- T Tritone
- G Perfect 5th
- Y Minor 6th
- H Major 6th
- U Minor 7th
- J Major 7th
- K Octave
- O Minor 2nd
- L Major 2nd
- P Minor 3rd
- ; Major 3rd
- ' Perfect 4th
Other craftable instruments could be an acoustic guitar or a harp and maybe a flute.