Hello,
I am a dev. Just got pyxelEdit. Really a great program.
I've spent some hours on it and noticed some things that can be improved imo.
When you ctrl+alt to copy an instance this instance is snapped but when you ctrl+alt on the created instance after placing it but not deselecting it the snapping does not work anymore. I would like the snapping to work automatically by default even if you are making the same action quickly instance after instance.
I noticed some data is lost when you work without making a save file. So always make a save before working :)
I will add some more stuff if I see some.