I am currently not working on this. Haven't in over a year. It may be released in the future for free. It was too ambitious, and out of the scope of Construfeasibility (the physics engine isn't robust enough for what I wanted to do.). The code's a mess, and the newer versions of construct break the physics engine too much. Most importantly, the work to fun ratio was too small to be worth it. Good design goes a long way.
TowerClimb gets all of my attention now.