Thanks! We hope to release on Steam at some point but have no concrete plans at the moment. The game is a hobby project for everyone involved so we have to choose how we spend our available time. Right now we're focusing on bug fixes, updates and trying to get the game noticed. If and when we release on Steam the players who have bought the game on itch will get a key for sure.
Sorry to disappoint - hope you get to try the game out at some point!