I cannot promise a GOG release just yet, but I will be applying for the required publishing deal. If that goes through then yes. It would be a simultaneous release. The game is already on Itch (= DRM free version) and that too will be available on day 1 if I can help it.
@gibmiser
Fair enough if that's how you feel, but the assets are actually all different. Literally. It's just your mind playing tricks on you I'm afraid.