Greetings,
We have now implemented a system to issue steam keys to those that have already purchased the game on our own website. You can follow this link to get your steam key: https://registry.star-made.org/profile/steam_key Your account will be downgraded in the process.
Once you get your steam key and activate it, you must link your key to your account to re-upgrade https://registry.star-made.org/profile/steam_link
This system is temporary, as we wait for Valve's response on giving us the permission to automatically grant the game to a steam account.
Thanks for playing StarMade,
- SM Team