This is amazing. I don't even know how to do half of what you managed to do in this time. Amazing video, amazing demo, amazing tribute to Dani. I'm going to try to make some levels on here
Dani could have made this, it works better than most free level editors I've ever used. The only feature request I might have is for a ctrl-z undo option. I rely on hotkeys a lot so that might make it easier for level designers to quickly erase their last move.