the goal of the game is to deliver the mail in as fast as possible, you must get to the mailboxes by moving the train with the A and D, while also keeping the train from falling apart by walking over to the warning signal and pressing space, you move the goblin with the arrow keys, and place the mail in the mailboxes by looking at your letters and pressing the number above the letter with the seal that is the same color as the flag on the mailbox, in hindsight the game is a lot more complicated than I was intending, I had hoped that the in game tutorial explained all this well enough but I must have messed up.
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I was also kind of lost until I saw this comment but then the game completely opened up for me! There's a lot of potential in the double control scheme of controlling both the train and the goblin. I can imagine this frenetic arcade game energy if the game kept going, adding challenge by mixing up the mailboxes, making the train longer etc