Controller support has been added, that one light by the warp gate that wouldn't stay lit is now fixed, an offline version of the online challenges has been added. I'll need to double check the offline challenges because I haven't had a chance to thoroughly look at the game myself :D

A quick check to see if the offline version of the online challenges actually works is to find the challenge that is just after you go through the falling rocks part to get to the mines. After clearing the rocks, go to the extreme right of the screen you come out to after the rocks, go up, and there should be a challenge symbol just hangin' out :D.