I think the previosu comment sums it up quite nicely, It's quite hard to know what you have to do in ceirtan parts of the game, which can sometimes really lose the player and just feels frustrating.
Only thing i'd add is that the soundesign could have been a bit better, the interact sounds are really good, but the train sounds especially the wheels going over something sound was super annoying, for sounds that are gonna repeat alot always use multiple different sound clips and make them randomly loop with slightly different pitches. Also a walking sound would have been really good, much more immersive, even though the train is quite loud, I think a quiet but noticable footstep sound would have made the game much more immersive.
I really like the graphics, I think they look cool but my fps would drop occasionally and it was annoying, I am guessing you used a particle system for the fog/dust that sometimes makes it into the train? Unities particle system is actually quite bad and unoptimized and its better to avoid using so much.
The game is quite good but it is just really slow paced cause its not really clear what the player has to do, I really like the style it looks super rad!!!!
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