I thought this had a fun premise and a decent gameplay loop! I really liked that the darker tiles made the player move slower, as it made taking shortcuts into more of a tradeoff to see if it would actually be faster than following the lighter areas. I think a compass leading back to the hole would be useful - I would sometimes get lost and/or forget to pick up more gorbs since I couldn't really tell how to get back to the hole.
I also think a dynamic timer would have made the game more interesting - like the time depends on the distance between the hole and orts. It could also be interesting for there to be more leeway early on in the game as the player completes more successful transports in a run, that leeway gets shorter to force players to take the most optimal routes the longer they last.