I made a web based basketball play drawer. Looking for feedback.

This is pretty cool. My son's coach has him memorizing plays, so this is something he can use. I just shelled out for a dry erase board for the same purpose last week!

One comment is that the boundaries aren't letting me drag to the bottom corners. It'd be sweet if the text could shift above the player dot when you come close to the bottom edge.

The eraser tool could have a translucent cursor so that you know how wide the eraser is.

Undo and redo.

Check boxes for different court configurations (the one that comes to mind is rectangular key vs trapezoidal key)