Unity seems to have found a security issue with their older versions. Apparently, bad actors can run malicious software on Unity projects with the privileges that those projects have. They've asked me to release my game under a newer version of Unity. Seeing as how I don't have the source files, this title will have to be removed from the store page.
Anyone who owns the game should still keep it in their library, but it's sad to see this project go.
In the future, I'd like to recover as much as possible and release this game again. Until then, thank you all for playing.