I'm happy to support projects like this!
It would be great if you could consider some simple pixel paint functionality at some point. I find that theres a lot of back-and-forth into the tileset when creating a map, so it would be nice to just do minor tweaks without opening another package. Also, at the moment I am upgrading the tileset of a vintage game, the tiles are a mess and its almost impossible to understand them without seeing the changes in the map, and seeing which tiles goes where in realtime.
I know that doing a pixel-editor can open a can of worms in terms of functionality, but some basic pixel placing would be enough I think :)