This is a clone game
We are working with SDL, the plan is to move what little codebase we have to C++. I do want to still be able to interface with Swift and Kotlin code, so that's an interesting issue to tackle.
We're not yet quite sure which graphics codec we're going to use, but it's likely png, it looks like we have to source our own regardless: https://wiki.libsdl.org/SDL_PixelFormatEnum
Optional:
Is there a portable DAW file, that works between DAW's? Otherwise we have to use MIDI and somehow map MIDI notes to .wav files ourself.