Actually this is very useful :) Good job!  although saving would be nice.  

Awesome! Now I have a tool to layout all my conspiracy theories!
Jokes aside I could totally see myself using this as a bit in my videos when explaining something stupidly complicated, the jankyness level is perfect :D

It is a little unintuitive to be forced to use right click to conclude actions, especially for like the images and connections (which btw, why isn't there an alt form which points like an arrow). Allow people to use the tools the way they want to (also add support for enter to finalize)

Support for GIFs I think is a must have for a tool like this, I mean this is the perfect opportunity to capitalize on the fact that even legit picture editing programs won't have a feature like that. :0

Some better movement options I think would be great, nothing too fancy, just scroll to zoom and middle mouse button/arrows/wasd to move, as long as they're always active. I think the move tool should really focus on moving the pictures, maybe have rotation as a secondary action then.

Finally, I don't think you really need to show the bounding boxes when drawing, it just adds to the confusion (I mean, if I really want to see them, I'll press F2)

Also man, those screenshots are hilarious XD. Great work!