Huh, interesting problem you're having Kashlavor, did you check inside the unpacked level's directories?
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Why yes I did, and discovered the secret. It seems that the ResourceExtractor does not unpack the info.xml and icon.png which seem to be necessary for running the game, even testing levels.
Thanks for the quick reply!
(Lol, figured it out. Would be nice if you guys added that in to the ResourceExtractor)
Also I noticed that the trusty old example/ folder is no longer in the assets.bin, would be nice if it got added back in.