I won the game on the first try!
Great game about the theme! I notice I didn't need to make a loop and the game still progressed me - I thought this might fail me, but I guess it was allowed to make the game more forgiving, which also works out! But maybe a bonus could be given for completing the loop - maybe there's a card that does this but I never encountered it?
I liked how the cards flash outward when they are in effect.
I like how you show them at the side so you know what you picked.
I like the 'card system', it adds a layer of strategy.
I like how different cards can give you more tracks, so it adds a feeling of progression.
Some feedback:
At the card selection screen, I should be allowed to still hover over cards and see their effects. Since the copy card copies the above card, I wanted to see the card it would copy.
There was a minor bug where one of the red powerups spawned at the corner of a rock, underneath it, which could not be navigated to, but it's minor.
I also notice you can right click the arrow to change the train direction, but this wasn't indicated.
This is more of ideas:
I think the game could also have progression in the map layout. Maybe even debuffs that are introduced later on that when the train goes over, adds a score penalty?
Speaking of debuffs, I think the red powerups should be a different colour, as red is associated with negative buffs, and I initially avoided it. (I played on Web non-full screened where text is displayed at a small size.)
Overall it's a charming and intuitive game, and I don't have much to critique on. The music was also pretty catchy and relaxing. Great job~