[thrtythreeforty]

You're very close to Aikin shape note heads! These help sight-read in any key, since they're always shaped according to whatever the relative major is, and so it's easy to learn the intervals between any two shapes.

https://en.wikipedia.org/wiki/Jesse_B._Aikin

[CGMthrowaway]

Yeah this is basically shape notes with colors, in a MIDI format. Not helpful for non-digital musicians