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I'm a bit confused. Do I click on the bottom bar of icons? Is there more to the game than just blocking the code with keys?

(+1)

Sorry about that, when you block code with the keys you'll get "Bugs" which is the currency of the game. After that you can take one of the key and drop it in the Shop area then click on one of 3 upgrades (icons). But yeah the concept is just to block code with keys but thanks to upgrades you can change the keys type etc.