I already have a few new animations and an items pack planned! I'd be super interested to develop some spell effects too though! Although it might be a while :)
Here is you an update where I am a now. https://www.reddit.com/r/godot/comments/plkimr/update_on_my_little_topdown_game_...
A few more suggestions, is maybe some houses, cave tilesets, and dungeon tilesets.