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What a cool game, the hit effects are really juicy, it could have a sound fx too, but was really entertaining. Even when you can just trap the heart beween boxes as Kilian did and watch the highscore go up. For prevening this I though about suggesting another shapes foe the boxes, but maybe the collisions and bouncing would get unpredictable.
I would suggest making the boxes repel themselves, or having an area where they can't get closer together. Or another approach could be making them float randomly when you release them, or making them go back where they came from. 
I find you idea refreshing, this can be a fun casual game.

I appreciate your input, HydriaSensus. You might want to give it another go now that I've made some adjustments in response to your suggestions.