I don't know if you realize it, but you have basically made a remastered version of Imagic's Dracula on the Intellivision game console circa 1983. This is in no way a bad thing and I think it's awesome tbh. It has the day/night cycle and you have to get back to the graveyard before the sun rises. It was quite innovative for its time. Yours is obviously more complex and prettier, but in the same vein (pun intended).
...and btw, instant purchase for me. Thanks for making this!