Thanks for playing!
There's also three playable characters in the current build. But, probably not enough replayability to unlock them.
I didn't get around to making difficulty settings or implementing alternate game modes. (Although the unlimited is in the game it doesn't work currently)
The initial plan was for 5 areas and a story to go along with it. I also didn't get around to cinematics to transition between each area and to further the story.
I'll keep working on it though.