Not a dev, but i can explain this, its a false-positive, typical for Jiangmin..
Jiangmin warns about everything, that COULD be used in a malicious way, even if the program of that tool wont do..
For example, for me it always triggered the "Trojan.KillFiles.mf". It triggers, because it deletes files, problem is, it is programed to only delete files it created itself.(The Launcher installs Microsoft redistributables to make the program work and then deletes them after, triggering the KillFiles Trojan report in Jiangmin.)
In the situation of this game, Hack Tool is a program to crack, or keygen for activating/installing pirated software.
In other words, the creator hasnt paid for a license to use that engine and used a tool to have a cracked version.
Also, i douvt the creator will answer this to you, because then they would need to admit that they use and engine they havent paid for and for that Itch would kick them off the platform -.-'