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If an idea isn't doing so well don't be afraid to start over. 

DON'T OVERSCOPE. If things are going well and you want to add more things then wait until you're done. Don't add any big things in the middle of the jam. Don't overscope. If you feel like you've underscoped don't add anything else. If you finished the game is 24 hours or less. Great now you can add more levels polish the game and stuff for the remaining hours. Don't overscope. A finished game looked better than an attempted idea