Wow, this is getting attention very late.
Fix the collisions, if your parallel to a shape and move towards it, your shape will clip through it, making it too easy to wedge into corners.
True. Did not change that to make it possible to get through those small spaces, but it is absolutely ugly how it is. Will change it.
Increase the fall speed when pressing the down button imo, the main point of speeding it up is to get to the next shape faster, you are normally happy with the position if your pressing this button.
Le pause function :p I had to shut it down to type this out and I was doing well
You need to pack LWJGL with the jar, not in /tmp/.
My little framework is packed with all the natives and extracts the needed ones there to be usable, but it does not really work as it seems. Did you run any of my former games? Deleting the folder should help then because I updated to LWJGL 2.9.1...