I ran into the memory leak issue too, where it eats up like 80% of my 8GB after just a couple of scenes. Since the dev hasn't released a fix yet, I put together this "quick and dirty"
workaround that clears the game's memory after a set time. I also made a second, more advanced script that lets you manually clear it with a button in-game, and also lets you toggle the timer reset on and off.
To install: Pick the script you want and drop it into the game folder inside the game's main directory.
To uninstall: Just delete the script file and its .rpyc file from that same folder. It won't mess with your saves.
PS: If you
don't want to mess with scripts, I also noticed something else that helps: hitting
Shift+G in the game and changing the
framerate. The specific framerate you pick doesn't matter; the
act of switching it is what's important, as that also clears the memory.