if you want to change the rez you will need to click the flag button when you find the rez you like, clearing everything and reloading the canvas
I have wanted to make something like this for ages, but what really got my to start working on it was Chrome_cat's ☁ Cloud Pixel Editor 48x48. I really liked it but I wanted to add stuff to it. I did not want to use the code already in it because I don't think I could get it to work the way I want without heavy modification, so I just decided to make my own version of that code, but in a way that I could work with it better. this project is a work in progress and I do not think it will be finished for a while.