Challenging game. Not sure how it related to theme? Got caught out initially by change in ship number, maybe an added sound would have helped that. Really good for no game engine.
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Since branching out means, to do something different from what you usually do, I made the change of the numbers to be interpret with theme, in some situations you got a divide by 2 or 4 or 7, etc. There is a timer in the right corner which shows when your ship number is gonna change, but I will add sound.