This is not "Killer Queen". This is Killer Queen - https://e-hentai.org/g/105240/ae316dccb5/. It's an older game with different CG and I believe it has been mistakenly expunged, possibly in favor of this gallery.
This one is Secret Game ~Killer Queen~, an alternative version/remake of Killer Queen. It has already been uploaded (minus the first two pics) - https://e-hentai.org/g/636175/11630027bf/ except this one's PNG files are "uncompressed". Don't really know how it works, but it's pretty common to find in HCG archives. At least according to Irfanview it's indeed PNG, but has the same size as BMP. It's basically BMP disguised as PNG, visually identical but MUCH larger in size.