Thank you for playing my game and leaving a comment.
I added the art to the game page so that people can see the different ending screens, and in case they got really unlucky with the coin drops. I'm glad that you like the sprite and art: I wanted to try designing and animating my own sprites for once. I have learned how difficult it is to make even a static image from a specific perspective to look correct, and have gained a better idea as to how difficult and time-consuming the animating process is, even for simplistic designs.
I added the encumbrance mechanic to add a little bit of complexity to the gameplay. I wanted the player to decide between depositing their current collection now and returning back to normal movement speed for the next batch vs. holding onto their collection for a potentially larger payout whilst being slower (and potentially not getting to the coins in time).