Download says windows+linux, but in fact its win-only. But since its NW.js engine here, it can be run by using binaries from official engine website. Maybe mention that in game page at least, if you are not willing to properly support linux?
I mean, it's not a question of being unwilling, the engine only compiles for Win or Mac, but says the win version is compatible with Linux. Not being a linux user myself, I had to take its word for it.