There are some things that can be done better. There are some things that can be improved. This isn't a perfect product. But it's one that I want! Good job!
Other people covered most of the issues well enough, I think. One key thing that I think you should do is make the cursor change in the appropriate ways when hovering over certain things. It's not a terribly hard css change and I think it would make the app look a lot more polished.
Thanks, yes that would be appropriate (e.g. a movable object should have a movable cursor). I'll check through the app for this, although any specifics are much appreciated. I'd be grateful for feedback on your experience, my email is on the "About" page.
Other people covered most of the issues well enough, I think. One key thing that I think you should do is make the cursor change in the appropriate ways when hovering over certain things. It's not a terribly hard css change and I think it would make the app look a lot more polished.