If you're looking to play Heartbound safely and support the creators, it is available on and itch.io . Both platforms offer a free demo that allows you to experience a significant portion of the game before buying.
Based on common knowledge regarding this specific file format and versioning: Heartbound.v1.0.9.57.rar
"The game is great, but the dev is the real star. He's so open about the process on Twitch." If you're looking to play Heartbound safely and