I suggest you keep iterating on it. There will always be bugs to fix and improvements to make. You've shown it on HN and got some feedback, so show it to other

I suggest you keep iterating on it. There will always be bugs to fix and improvements to make. You've shown it on HN and got some feedback, so show it to other people. See if they can understand how to use it or if you need to add some cues to guide them how to use it. If users need to watch a video on how to use something I think that might indicate a UX problem. The first thing I noticed was what anigbrowl mentioned about moving the mouse off the branch. The branch should stay open even if the mouse deviates a little bit. You should pretty it up a bit. I didn't understand the color theme. Seems like there are different shades of green but they intensity of the colors aren't aligned to the scale. Also the pin icon looks out of place. Good work I like the idea. Just don't give up on it.