im having the exact issue, i dont know how harmful it actually is but id at least like an explanation since it specifically came up as a trojan and not just a vague "might be a bad file" false positive.
I believe there might have been some sort of interference with downloading the game from the web page. When I installed the game using the itch.io app, there weren't any problems with my antivirus and I scanned my computer multiple times to find that the trojan was no longer attached to the game. I recommend you play this through the itch application if you want to continue playing the game in a safe way!!