Really well-made video!
I appreciate that you didn't spoiler too much of the mod

You covered pretty much everything UXXL has to offer: the story, new music, new buffed enemies, etc. except the visual changes, although i think you enjoyed them?
I know that the first version had many flaws and difficulty spikes (Greece

) so it is nice to hear that the difficulty is fun and the small flaws here and there don't ruin the gameplay.
Regarding the black screen issue when you tab out: Did you experience this in windowed mode too or did that fix your problem?