I really love the ui exploration! I wish canvases had edges connecting nodes
(Leaflet cofounder here) - thanks, and good idea! Yeah right now canvases are quite minimal, lots we can improve both with basics like selection/drag, and more types of canvas-specific blocks. We'd love to get some kind of freeform sketch block at some point too, though more complex, a few more frequently requested things we want to get to first, like simple tables and font options!
consider tldraw :)