Hey, coder of the game here! The game is packaged into a single file for convenience sake, through the built in feature of the used game engine - Godot (you can read about this feature here on the official documentation, it also mentions the false positives this feature can cause in more primitive antiviruses: https://docs.godotengine.org/en/3.3/getting_started/workflow/export/exporting_fo... )
The Acronis service that gave this false positive is mostly used by people for backups and has a very primitive and dumb antivirus solution that is known for giving a lot of false positives.
Hope this explains it.