Interesting game loop. I like the narrative, mining cheese on the moon for mooney. Very funny! After a few loops, the game became a little stale, and there really weren't any surprises (discovering things), mix ups (unexpected decisions), excitement (like the fighting enemies phase in Dome Keeper), or tenseness ("Oh no I've almost lost") unless you allow that to really happen. I like the concept though, feels like you've got something here!

I also like trains.
I like the concept of the game. The only thing that felt a bit strange was the level up mini game. It felt a bit unrewarding that I needed to spend "money" on the upgrade but then also had to complete the mini game. Maybe allow the user to play the mini game for a discount or something before buying the item. That way it doesn't feel like you are “paying” twice for it (once with your money and once with the minigame).
Having the train act as a timer is a very smart idea. I like it.

This game is actually much more interesting than what I initially expected. In fact, I thought at first that this would be a generic idle game, but the train mecanic allows for an interesting gameplay. Loops become more and more stressful thanks to the fact that you have to go deeper and deeper to find your ressources. This really helps maintaining a good amount of tension throughout the game. Well done !

This game is simple yet fun. I love the stress of missing the train when mining, especially at the end when you have to go further down to mine more rock and not being able to see the train. And its a good way to make the game harder ,even if you get good upgrades, in a natural way