You can play the current free version (0.11) for free by downloading the game here. If you want the latest paid version (0.11.2) you either need to pay the $10 at their DeviantArt page or SubscribeStar and have your Discord account linked to either site. You will get an invite to join once payment is complete.
The leopard maid at Pyra's palace is what I'm guessing you are talking about. Eventually there will be scenes involving her at a later date. No character is forgotten, but the creators are more focused on expanding the world at this time.