Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
This tool creates .pal files from screenshots of Lunar Magic's palette editor. May or may not be useful when you edit palettes in an external tool and don't want to copy each color back over manually.
Make sure to read the readme for usage instructions and a tiny bit of further information.
(July 8, 2018: now supports screenshots made with monitor scaling settings of 100%, 125%, 150%, 175% and 200%, and also auto-closes on drag-'n'-drop when no errors occurred)
That's certainly a nice tool, WYE. However, I'm sad to say it will be rejected, because of your 'updates'. I tested your tool focusing on the new monitor scaling feature... and it didn't work. The whole 'drag-and-drop' feature, however, worked fine, so kudos to that.
All in all, by the tests I made, the monitor scaling feature didn't work. If you have questions, feel free to PM me or DM in Discord.