I am so very glad you liked the cauldron part! The frog is mostly just there to eat failed potions (chum) but you can try feeding him other potions too for surprises :D
I found the frog's text problem. I didn't see it during my tests.. but it should be an easy fix. Thank you for finding it.
The nighttime is... admittedly not as well thought as I hoped. I thought I wanted the player to have something to do at night other than just gardening but it seems I feel into the "more features = better games" mentality while making it. But I'll still try to improve it, maybe add incentive when killing them or something.
Thank you very much for your kind words and for playing!