I would like to see a pusher in the next version, like a sad face that you can push around. Maybe even a physics collision would be cool. With that you’ll have covered most of the beginning problems people have with collisions.
Thanks for putting this together. It helps a lot! When its done I’ll fix the grammar for you. I wish there were more collision examples available. This one could be really good (haha, maybe even ‘official’ tutor material 
).