Hmmm, that's a new one :/ Thanks for letting me know.
I'll dust off my Mac Mini tomorrow and try it out. Are you hearing any sound/music playing? And do you happen to know what type of video card is in your machine?
No, no sound/music. Here's the use-case:
I right click on "MewnBase" then click Open (To get past the silly Apple message since its not installed from their appstore)
Then the window shows up with a black screen. After a few seconds I get the loading umbrella of doom icon that spins for what I'm guessing is indefinitely.
Specs
CPU: 2.53 GHz Intel Core i5
Mem: 8 GB 1067 MHz DDR3
NVIDIA GeForce GT 330M 512 MB
Intel HD Graphics 288 MB