The reason for the warning is, that the game is in quarantine.
No one with authority will tell you why it is in quarantine.
I already told this, hence I guess a translation issue. I highlighted the reason why you will not be told the exact reasons.
No one will tell you why the game was put in quarantine. It defeats the purpose to tell actual malware uploades why they are under suspicion. It is the standard quarantine message. That's the same for all quarantined games.
And I want to add, that there is hundreds of malware uploaded on Itch per week. Some more obvious than others: https://itch.io/t/1659440/psa-beware-the-try-my-game-scam .