To be honest I found the way nodes were restricted in the UI an odd choice, coming from both how Photoshop and Illustrator handle node editing. The game's goal

To be honest I found the way nodes were restricted in the UI an odd choice, coming from both how Photoshop and Illustrator handle node editing. The game's goal appears to be a friendly way of teaching such concepts yet it limits the user's interaction/experimentation with them. Being able to manipulate the control points after adding them, at least in angle and creating cusp points would make understanding them easier I feel. At least some initial interactive demo node for the user to play around with.