Never thought I would see a let's play of a game I made! Thanks for playing!
Your comments about the length of the game are valid. I went with 6 stages with 10 levels each because the game that inspired me also had ten levels per stage. Given that I was struggling to come up with formations by the end of development, perhaps I should have cut it down quite a bit.
A level select or the ability to save and come back later might have been good options to combat fatigue too.
Regardless, I hope you found some enjoyment in it and thanks once again!