It's not a virus, and an executable isn't an installation, lol. It was made in Godot so there's probably an easy way to crack it open and look at the code.
Godot can compile to a .exe by default, compiling to HTML required additional packages that I couldn't figure out at the time. I've since lost the source code so this is all I have.
It's a pretty good idea to be suspicious like that, but there's nothing more you can ask for and nothing more I can provide lol. You can look at my other game instead, that at least runs in HTML5.