This is wonderful! Two questions.
1) Can I use maps created with this tool in commercial products? Likely just Mothership adventures posted here on itch for a buck or two.
2) Need any dev help>
One suggestion I have: When I hover over the icons, it gives me a description. It would be nice if it did the same with the props (if you used these for specific purposes). And perhaps the ability to save as you go in case you can't complete your schematic in one sitting.
WONDERFUL job. I'm in awe of this product. :)