Nice, thanks for sharing. I love Excalidraw but tldraw [0] (which I assume is a play on "tldr"?) seems just as good if not a tiny bit better in some small ways at first glance. There's also an Obsidian plugin, though it is still in beta [1].
Very happy to see more options in this space. Draw.io is still usually my default for "official" drag-and-drop diagrams, but these tools fill a much-needed gap (in the remote-first world) where physical whiteboards used to be, and lower the barrier for quicker diagrams and ad-hoc discussions.