My main experience with the demo on the site is that I asked it to add a simple feature which would not even necessarily let you win the game, and it would spend >100k tokens in a loop of "laws broken" until maybe adding it, maybe not. After burning half a million tokens just to add an extra line of walls so that teleporting 2 squares up wouldn't let me win, my API key got rate limited and broke the loop.
On top of that, the solutions feel like patchwork. I asked it to let spacebar flip the board horizontally, and it responded by making the board completely symmetrical including 2 flag poles. At some point it just has to say "this isn't possible without breaking the laws" or think of an actual workaround, because if I was making a game, suddenly having 2 finishes would be unwanted behavior for me.