This game is very cool. I found I could do everything in either compact or V formation and didn't really use the horizontal/vertical formations. I think you forgot to loop the music. Good fun though and a great idea for a game.
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Thanks! Yeah I initially wanted to force the player to switch between the four formations, but it was already fun enough with the V formation and the compact formation, and I didn't have time to add constraints to force the use of the other two.
And I realized too late about the music as well, I'll fix that after the voting is over.