I really liked the pixel art graphics and the gameplay was very fun too! I liked how the player is forced to move between cabins and the transition of the rooves disappearing also added to the overall high level of polish the game had, especially with sound design which I thought fit the overall feel of the game too! I also really appreciated the touches of making the tracks visually move faster when the train speeds up and the countdown notification was a really good way of notifying the player while still allowing them to move about the train completing other tasks.
I think some of the gameplay elements could possibly have done with some balancing (however this is a jam so I completely understand the time pressure!!), for example I found it was better to ignore the cog as focussing on just the coal meant you could get to the end before the cog broke anyway even with the obstacles, and I often felt it was better to just let the engine break and then repair it rather than cooling it down as this felt like it took longer than letting it break and building the coal back up.
Overall, I had a lot of fun playing: the design, audio and visuals all worked well together and really like the feel of it. This is an amazing entry!