Not that great. You should have added a menu screen for configurations for controls. At the very least a joy2key config would have been helpful.
For a Ludum Dare game? Dude, this was made in 72 hours. No one has a configuration / custom key-binding menu for a three-day gamejam prototype. The point is to demonstrate a cohesive playable concept, which they did extremely well. Frankly, I'm impressed with the overall quality they managed in that time frame.