The idea for the game is really good and well executed! 

I feel like the options on screen are a little messy. The buttons to undo and clear the drawing/slide should reset the ball, powers, and doors because other wise you can clear in the middle of a level and effectively get twice as much (or more) drawing power. Similarly, the button to reset the ball + powers shouldn't be separate from the button to reset the doors because it can cause all sorts of weirdness during a level. You could even have the play button become a stop button during play which resets the level. Then you only have four buttons, undo, clear, play/stop, and pause, which is a lot easier to interface with and pick up as a new player :)

Also, I was a little confused because I couldn't hear any sounds/music but there was a slider for it in the settings menu.

Overall thought the game had a diverse amount of puzzles and mechanics and was pretty fun, great job!

Really fun game! Not sure where "slide" fits in, but I liked the game anyway. Creative puzzle aspect.