Sorry for misunderstanding, I thought it was spam, because I only skimmed your comment and thought it was a link to some shady website (had many of those comments recently) and I didn't want to click on it.
Now to your question, I can guarantee this is NOT a trojan virus and I'm not sure why Antiy-AVL detects it as such unlike the other virus scanners. One possible explanation could be that the game uses Unity's PlayerPrefs to store data, which is a rather uncommon method since the data is easily accessible and can even be rewritten by the user, but in this particular case not important, it only stores the difficulty settings, which is why I chose this simple method.
Even though I'm not sure about it, since I don't know how Antiy-AVL operates, it might be the way that the game generates and saves data that causes the program to think there is a hidden virus.