Ending

I just finished this short game which ended without any warning whatsoever - click to go through a doorway and bam, ending scene. Is there any way to get back into the game to examine the collections? I did enjoy the game, very old school even when it was made 4 years ago, and quite fun, but part of the fun is looking at the finished collections and now I don't even know which ones I finished. What a freaking ripoff.