Over all a really cute idea. Animations of the player character were really nice and satisfying. And I love the effect of the heart actually leaving physical pieces of itself on the ground.
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Well there was sort of one thing. I didn't know I was supposed to get the double jump first so I was trying to stack the small cubes on top of each other to jump higher witch didn't work because I wasn't able to jump form the small cubes at all. But I don't know if I should take it as a bug since I wasn't supposed to do that in the first place. :D