This is a nice concept, although I feel like it's been done a lot before. (Although that may just be my distaste for this style of game in general.) The implementation is pretty good, there are a few improvements you could make (ability to switch order of directions without deleting a bunch of them is one I wished was there) but there was of course the 48 hour timeline to contend with so these issues are understandable.
Like others have said, I really wish you could pan the camera. The levels are already trial-and-error enough without the inability to plan ahead compounding that.