F12 to open up dev tools.
Maybe esc to bring up the js console or maybe it is already open.
GC.app.gameModel.extraLives = 100000;
GC.app.gameModel.itemSpawnMultiplier = 10000;
GC.app.gameModel.timeMult = 0.5;
GC.app.gameModel.energyEarned = 10000000;
There are many more.
explore objects/keys on GC.app.gameModel