The app, which was pretty basic and lacked of functionalities such as infinite drawing space, easily movable objects, easy save... has been updated recently. It probably deserves a HN post again, since it turned into a lot more usable tool.

It's great to see people working hard on projects, but HN doesn't have enough space to tolerate most reposts for feature upgrades.

In this case, there was a major thread just 80 days ago, so marking the current post a dupe isn't really a hard call. Sorry to disappoint.