“Chernobyl” is just factually wrong in this case. Even if you have decided that you want to spell it the Russian way in your day-to-day life, the name of the game spells it “Chornobyl”.
It’s the same as article using “Bald-hairs Gait”, or “Sidd Meyer’s Alfa Sentary”
Flappy bird is the rip-off version of a different game already