The automatic door thing is definitely something that someone else brought up during playtesting, but I was hesitant to add another button to go into the door, in fear that players would get confused how to enter. If I had a bit more time, having an input icon bounce above the exit to teach the player would have been the way to go I think!
The palette limitation really helped me to keep the art consistent and if I go pixel art with other projects, I will most certainly make use of a palette like this!
Thank you so much for the kind words!