Hi,
first of all, I really like the idea of this mod. I think it is an interesting addition to the quality system.
After updating to Factorio 2.1, the mod crashes during startup with an error related to tree-plant leaf sprites:
The given sprite rectangle is outside the actual sprite size
I looked into the issue a bit and it seems to be caused by the tree sprites. From what I can tell, the tree/plant sprite handling changed between Factorio 2.0 and 2.1, and the hardcoded tree handling in the mod no longer matches the current sprite dimensions.
I made a small local fix that solves the crash for me. The mod now loads correctly again in Factorio 2.1.
If you are interested, feel free to contact me and I can send you the fixed version or the patch. I would be happy if this helps keep the mod working.