Heya and welcome here. Glad to see another calculator programmer around.
I'm not a huge fan of puzzle games (except platformers), but I still can't wait to see what you will come up with. To upload files, you need at least 5 posts, though (spambot protection), otherwise for now you would need to use Mediafire.com for files and img.removedfromgame.com for screenshots.
A level editor sounds neat.