I think this game is really cool, but I wish I could play custom levels in mobile (Android, iOS), because these days people usually play game with it.
I heard that Android one could play customs in debug mode (deleted it now..?), and iOS nowadays can download files by safari and load it via new files app mechanism.
If you support custom levels in mobile, I’m sure more people will love your game! I’m excited to check out this and some other features in the future.