Level complete, all items, cats, coins and gold creatures collected. A very nice job! It would be helpful if Shreeps' house contained a warp to an explorable annotated map a la Exquisite Knorpse 2. It would also be helpful if the credits showed the true position of each gold creature and if the entances and exits of areas were marked on the map in some way, perhaps by being coloured differently.
I explored the entirety of Moonlit Bluffs and the Enchanted Castle by hand, by teleportation and by map teleportation. I walked over every single floor tile. I examined the level in the editor. At no point did I encounter the golden lizard; I had to get it from the credits to progress. I also observe that I collected 50 of a (presumed) maximum 51 creatures: there is a creature on the left, a bump-headed squat biped adjacent to the horizontally-flying spiky thing, the wall-crawling shooter of trios of pink projectiles and the snail, that does not appear in the inventory of my completed file.