I have played the latest version (beta 5). You already know about the sprite corruption so I won't mention that!
Not sure if it was intentional, but sometimes I get no hint! (empty hint text?)
Sound test works (though it appears some sounds are duplicated). The enemy is pretty cool to fight, but it will be better when he jumps, climbs ladders and doesn't float between platforms
Perhaps it would be better to press right when "Exit" is highlighted, rather than down, in order to get to the "sound test"?
Looking forward to the next release.