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It's not really an overt simile, you'd have to be careful saying that, but yes, it would probably work. :3Also similes of 'glass of chocolate' and 'heart'.
But remember that you don't need to be forced into mentioning specific techniques, for example, with the line 'Bitter. Sweet. Alive' I would say something like the use of one-letter sentences creates a rhythmic feel, and also draws attention to the various qualities of happiness.