That's no good. Hmm...
So few things I can suggest you try:
- Try installing the game through the Itch Desktop Client - this will at least give you an easy way of seeing the log files and may have some clues as to why it's crashing / not launching (feel free to email it over to me at cairn4games@gmail.com if it's still not working).
- If you have Java installed - try running the .jar file directly (MewnBase/game/desktop-1.0.jar) and see if anything happens.
Do you know what kind of video card (if any) your machine has?