if you want to play on MAC, you need:
- Multipatch app https://www.romhacking.net/utilities/746
- A undertale windows version on mac (somehow)
- Open multipatch app, patch data.win
- Rename data.win to game.ios
- Put game.ios on resources
- the original one rename it (original.ios)
- launch undertale on steam (desktop shortcut doesn't work)