It was a long day, had a first meeting with a graphic artist who will be responsible for the character looks, and maybe more, if we can arrange all worldly matters.
I was also working on some tileset functions for the level editor, seamlessly connecting tiles from different tilesets in particular. I started with an alpha-masked blend shader, but ended up with simply overlaying sprites that only require minor modifications to the tileset structure and look great with minimal impact on performance. Anyway, the blend shader is also working, so it may prove useful for some other purpose.