An antivirus alert may appear the first time you launch the game exe because it’s packed and encrypted to protect assets; this is a harmless, false‑positive you can safely ignore.
Antivirus tools sometimes flag encrypted or “packed” executables—like those produced by Virtual Box—because hiding or compressing code is a common malware tactic. Even a perfectly safe program can trigger these heuristics‑based detections, but this usually only happens the first time you run the EXE, as the AV then caches a clean verdict afterward.
I can give you my word that there are no viruses or anything like that. If you don't trust me then please run it on a virtual machine.