Plenty of room for a REAL fridge in there!
I'd look as some raised flooring (duckboards) to keep anything valuable (i.e. the fridge) off the concrete. These can be as simple as treated timber slats. Those small sheds will allow water in where it meets the slab.
You could perhaps apply some sealant to help but you'll have to make sure that the door and roof are also watertight - don't want water getting in if it can;t get out.
Wait until you have a good downpour and then check out the shed for water.
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