Hey there Honk Honk Studio , I got your game for judging so here are some of my thoughts. I love detective stories and thought limiting it to a train was a good way to keep it from getting too large to finish. The movement of the sprites looked familiar to me, choosing a tall base was a smart move since it made the baby really feel small in comparison. The story worked well and gave me enough clues to make some deductions, though some of the jokes fell a bit flat to me.
I've worked on a detective story in the past, and noticed you fell into a few pitfalls my team did back then. Contest deadlines make things difficult to give a lot of control to the player, but as a player I wanted to be able to make the final accusation since I had figured out who did it after the 'father's eyes' comment. I'm sure you ran out of time so had the detective solve it all himself, but it did disappoint me to just watch it happen instead of help solve it. This felt more like a visual novel than detective game, so if you want to add in more detective gameplay mechanics make sure to give more options for the player to interact (and make their own mistakes) with the clues.
Overall, you had an interesting concept here, I just wish there were more places I could interject so that I could feel like I really solved the mystery.