Thanks for the feedback! I would definitely be open to a better design for the doors. The only thing is sprites are limited to 5x5 in Puzzlescript, and I need to have enough of that be empty that the player can see what's under the door (hole or ground) and each door be distinguishable from the door next to it...so I settled on this design, but I would certainly accept an improvement!
I'm fact, it does just now occur to me that perhaps coloring the whole door, not just the knob, would help. I'll file that away for a potential future update 🙂