Thanks @Martenfur !
I've pulled out what remains of my hair trying to get MG.Ext Tiled to work after stupidly upgrading from 1.1 without making a backup. Specifically I'm getting the following two errors:
Failed to load assembly '***/packages/MonoGame.Extended.Content.Pipeline.3.7.0/lib/netstandard2.0/MonoGame.Extended.Content.Pipeline.dll': Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
error: Failed to create importer 'TiledMapImporter'
The DLL DOES have the TiledMapImporter and I can't figure out what the problem is after reading through other posts multiple times.
As for Monogame and Steam (and Tiled), what tool chain would I use to get that working? (I want to stick with Monogame and Tiled to get this game on Steam).