Took me a a bunch of tries. Maybe I am misinterpreting the colors but I swear there were some times no matching frog. My last play through I had the target eliminated early and was waiting it out, assassinating every other frog that came through the door but then the game crash, was a bummer :(
Overall I think this is nice take on the theme. Relaxing music. Good art, I really like the pixel art and the train interiors. The frog animations were well done. The use of the theme here and wild card was well done too. Aside from the likes cheese description, the clues to match the animations were easily recognizable.
Adding additional levels with additional goals could make this a fun stealth, sleuth, and puzzle game. Maybe expanding it to have different objectives or ways of eliminating the target, like poisoning cigarettes' or food.
I am glad you were able to get the .pck uploaded and I was able to try it.