Finally tonight I took a look at the lights on this keyboard. The Adafruit's DotStar library handles them very well, but for some reason the last 6 in a chain had different colors. After some experiments, I desoldered the switches, removed that LED, put a different one in its place and the problem magically disappeared.
I also wrote some very simple code to make a pretty gradient. Static for now. I'm going to call it a day, but tomorrow I will probably try to make some nice effects, like a water ripple on each keystroke, or something like that.