So finally, part 3. After a few test runs and editing, I have added a key that needs to be collected in order to get to the exit. The quicksand rock blocking the exit was an unintended consequence due to the where I inserted the door, but it adds to the puzzle element of the game. As you can also see the test runs highlighted the time taken and number of gems needed made it more challenging, hence I made the time longer and reduced the number of gems needed.

Players still, need to be able to complete, the level after all.