I don't understand why I need to push space to go to the next level of an otherwise mouse-only game. I had to test to make sure I understood which the program read (for some reason I was expecting top-to-bottom left-to-right...), so the lighting commands thing suggested in a high comment would be great. It feels a little easier than most drag-n-drop systems I've used to drop in the wrong square, so an undo feature would be nice; if I overwrite something I might not remember what I put there. But those are all little usability issues on top of what looks like a pretty cool puzzle :).
 "ELEPHANT RAVE"){kind=icon}
 "Free Fred"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}
 "light-Bot"){kind=icon}
 "Tangerine Panic!"){kind=icon}
 "Box-zombies"){kind=icon}
 "Eat Rockets"){kind=icon}
 "Bot Arena 3"){kind=icon}
 "Icarus Needs"){kind=icon}
 "Electric Box"){kind=icon}
 "Guess The Password To Win Kreds!!!"){kind=icon}
 "Interactive Bob I"){kind=icon}
 "Cell 06 (demo)"){kind=icon}
 "Frank the Button"){kind=icon}
 "Clock"){kind=icon}
 "The Maze"){kind=icon}