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Well you can "save" by just leaving your browser window open. For situations where you suddenly find out that you need sleep or food or something and have to leave for an hour or more. Other than that, no saves or checkpoints.
You have to do ALL the levels in one sitting, or you can press P to pause the game, go get a drink, snack, and come back, but you can't save progress, only the items you've currently acquired, but if you do that like the above post says, you start back at the beginning.