A useful upgrade would be to add different symmetry options?

[bsugerman]

This is an AWESOME upgrade to the original. Thank you so much for your hard work.

If you ever feel like adding another to-do, adding a couple more options for symmetry would be really useful (horiz, vert, and NE/SW)?

[jmviz]

Thank you. Sorry for the late reply, I didn't realize I was not receiving notifications for this repo. This would be an easy enough addition, but I'm afraid I probably won't be doing much incremental improvement to this fork in the near future. I'm more of a mind to completely rewrite the app from the ground up in a new repo, but I haven't decided whether to devote the time to do so yet. In the meantime, I would be open to any PRs here.