The premise and execution of the environment are well in-line with the pulp sensibilities of Appendix N. The layout is clean, legible, and well-organized. The hub and spoke dungeon structure works well here. I don't think it detracts from the fun, but parties will likely catch on quick that "if we pull this lever, something is going to attack us." A party may struggle to justify staying after a few brutal combats knowing there are sure to be more. On the other hand, the Midas Ooze encounter is frankly genius; even if the party takes some casualties, I don't think they'll be too mad. Solid showing, here.
By the way, declaring OSE compatability and using the logo requires you to use the legal text (which I didn't see in the module or on the project page) from the TPL and to shoot them an email if you haven't done so already since this is for commercial use. You can still make your text creative commons, though.