Yeah we didn't have much time to expand on it as it was for a game jam. It we're adding it to our metroidvania so we'll have all those quality of life features!
To be fair you've not missed much, all you would do once you have the ruby and key is I teract with the pedestal next to the big door to place the ruby and then I teract with the door.. there is a little bit of story and then the game resets