This is super cool! The puzzles were satisfying. I wish there were more of them, but you already did a lot in 2 days. I didn't know you could move things other than the train at first, so it took me a long time to get past the boulder. I tried to ram it from a screen away, and the slow camera transitions kept interrupting the speed which was very frustrating. If this were a real game, I hope the intro level would give an on-screen tip to move an object outside the tracks to avoid this situation. That is my only complaint about the game.
I think this would be great for a 'Think outside the box' theme. I think it fits for this theme but not very well, as the solutions strike me as clever and not stupid.
But the art direction in this game is amazing! I think it was a great idea to use assets for everything, this way you could spend more time composing your scenes and making a cohesive design. The post-processing effects make the game look very professional.