A first small update is now live! Version 1.1 brings improved compatibility and a few helpful fixes:

RPG Maker MZ Tile Size Support
Tile Map Alchemist now additionally supports 32×32, 24×24, and 16×16 tile sizes for RPG Maker MZ projects.

Export Safety Warning
The tool will now warn you if you try to export tileset images that already exist with the same filename in the project.

Bug Fix
Fixed an issue that prevented exports to projects without any existing maps.

More improvements are on the way - thanks for all the feedback and support!