Well, I'm screwed. I'll give it a check with my own program. Are you willing and able to check the game engine itself to see if it is just this one title or not? http://zgameeditor.org
EDIT: idk man. Kaspersky picked up nothing wrong.
I just looked it up: the game was apparently made in ZGameEditor, an open-source game-programming language which is known for astoundingly tiny file sizes. Does this lower your guard any bit? http://zgameeditor.org