New update! (2.2.0) Many polish aspects, and the major addition of imported individual levels!
The update is available in the Unity package manager:

• Individual level hierarchies are now available!
  • Can drag and drop levels into the scene, which enables a more modular workflow
  • Available by saving as separate level files (.ldtkl) in LDtk
  • Because of this new feature, the root of the imported separate level file is now a GameObject instead of LDtkProjectFile
  • Check it out in the documentation
• Added a new tree-view in the inspector for the sub-assets LDtkProjectFile and LDtkLevelFile to see the Json data in a hierarchy
• Added a new button in the IntGrid section of the importer inspector to create an IntGrid value asset
  • This is the new way to create IntGrid tiles. The previous method of creating from the asset menu is removed
• Improved the entities section in the importer inspector
  • Entities can be visually grouped by tags
  • Given icons to the fields like in LDtk
  • Fixed issue where entity order was incorrectly ordered
• Improved subsequent loading times for the LDtk project importer inspector (noticeable with large LDtk projects)
• Fixed unnecessary dirty changes to sprite atlases appearing in source control
• Many editor-only classes/fields are now internal to protect against unintended accessibility and helps de-clutter the IntelliSense experience
  • Warning: It may affect your code if you were using it. Contact me if you believe that something internal should be publicly accessible
• Fixed a bug where entity prefabs would not be instantiated correctly when both the LDtk project importer and prefabs import at the same time (ex. Multi-selection or Reimport All)
  • This specific fix, however, prohibits the use of nesting LDtk Projects or levels inside of prefabs, or else import errors will occur
  • Contact me if this is a very important issue
• LDtk-related content drawn in the scene (lines, labels) will no longer draw if the associated GameObject is inactive
• Some assets will now use an icon designated for light/dark mode instead of previously always being dark in their inspector window
  • For LDtkLevelFile, LDtkProjectFile, LDtkArtifactAssets, and LDtkIntGridTile
• Changed/Added to the API. Mostly inconsequential, but correct any issues if they show in your code
• Many other various UI tweaks