I don't know about the specific one being mentioned here exactly, but if it's a RAT, it's pretty bad. A RAT, or Remote Access Trojan, is a way for someone to gain remote access to your computer via you downloading the software that's contaminated. It's like a one-way door into your PC.
i feel like when things are open sourced, systems like windows and mac arent familiar to what open source quite literally means. check who made these applications on the itchio page anyway, its hundredrabbits. i think its likely just a false positive