This is a nice work :) I like how it feels, congrats! One suggestion: the train-crash sound effect adds great atmosphere, but its frequency is a bit jarring. Overall, amazing job!
Viewing post in Build A Looping Route jam comments
I think it's not 4 days is short, it's just mismanagement on my part, due to various irresistible factors, I ended up with only 17 hours to complete this game from a blank project.
You can see that just under my game, and I decided to keep bringing it up every time I have the opportunity, so that I won't repeat the same mistake again QQ