There’s another thread here that I posted covering this already, but it’s important to note that the game is DRM-free from Itch, and you’re free to back up the game. It sucks that they can delist the game even if you paid for it, but your digital library really is forever as long as you make backups yourself. That’s way better than the alternative where the store hosts it forever but you can’t back it up yourself (like Steam).