This is a pretty polished entry! The game is quite fun, and it's a very good take on the theme. :D
I'm still a bit confused about the red commits. For a while I didn't know what to do with them, then I discovered by accident that I could catch them by switching on the bug-fix branch… I guess it makes sense, but it's difficult to figure out.^^
While the game becomes a bit repetitive (it takes too long before becoming difficult), it still provides a nice experience. Great job!