Sorry, I ran out of time. There is technically an Easter egg if you can find a way to get past the fireball, but that should not be possible to do in normal play. I don't think you missed anything.
Sorry for the delay. I have ideas for what I want to do next and have tagged this release as version as v0.1 so I can keep going, but I am not exactly sure on the time table right now. Thank you for the encouragement. :)