Just stumbled across mention of your game with this claim as a tagline. You... may need to fact-check anything like this before you claim it next time?
https://www.reddit.com/r/Android/comments/1pbhbd/dots_introduces_dark_theme_this...
That's from 7 years before you were "first" to do it. And even that's not the first game to do it, though it's the most near-identical example to your implementation that I know of. A lot of window-based games have dark modes, many of them courtesy of Windows itself having support for dark mode in several recent editions. EVE Online had custom UI colouring including several dark mode options well over a decade before you added it here. In the 1990s, Descent: Freespace was one of many space games which had custom UI colour and layout options, and that often includes an equivalent of a dark mode option. It was present in a few turn-based strategy games I played in the 90s as well.