Heya, thanks for playing! The goal for at least a "finished" campaign has been 25 stages, but I also want to include some smaller one-off optional missions that may have things other than combat. Boss battles and special enemies are also planned, but we'll need to sort out the story and some setup before we can start implementing them.
Best of luck with development, take care, and if I have any decent ideas I might toss one or two your way :)
Cheers!

