TODO
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* Win condition
* Battery and light power consts
* Mould resistances
* Mould power increases to prevent farming (partially implemented, needs balancing)
* Save game
* More sounds
* Five levels
* Seralize light on / off and colour selection state across day / night transition

Done
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* Light colour selection
* All lights multicolour
* Light direction configuration
* Fitting rotation
* Sunrise transition screen
* Lose condition (no turnips and no seeds)
* 'End the Day' button