I'm going to complain about how dark it is. I'm aware that that's the point. It's a stupid point. Not being able to see is the easiest way to make a bad level.
If you're going to alter an existing map, you should at least have the decency to alter a good one. That said, I'm impressed at how much worse you managed to make an already poor map.
What could drive someone to think "well I'm too lazy to make my own map why don't I just completely butcher this existing map in 15 minutes and publish it hurfadurfa" because that's ridiculous, make your own maps next time.
I mean, you didn't even do a good job.
Under Veil of Night is a solo map based off of Envy's map "Citadel". I retextured it in visualmode.lua to make it a nighttime version. Don't complain about how you can't see where you're going at times, because that's the point. There are certain bright points for reference.