I agree that perfect should be pretty hard to get, that makes sense and has some challenge, but I was struggling a bit just to get Ds and Cs - that may be more of a reflection on me though rather than the balance! I think some sort of reward and upgrade system would make sense, especially with the car wash theme, and would also make things a bit more varied. Still a great job though!
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I learned a lot about myself too, I'm a bit too much of a perfectionist for game jams haha. (Lead programmer here). I should have allowed a bit more time for upgrades, instead of focusing on precise enemy movements for instance... To be fair though, this is the first game I've ever built, and I'm very proud of myself and the entire team for putting this together.