The Steam shortcut I have says MESEN. It seems like it's only a problem when you're just starting the game. After you beat the first boss, I think it works fine. If it helps, here: https://itch.io/t/934473/4-useful-and-reusable-scripts and https://itch.io/t/944388/jjs-jank-script-examples
Anyway, it's not a bad game. A bit shorter to others in the same genre that I've played, but it does a good job of capturing the game play of the Metroidvania genre. One other thing I'd suggest doing is looking at Steamgrid and creating some assets for those wanting to add the game as a Steam or GOG shortcut in those launchers.