Really well done pixel art. Liking the concept as well.
Not sure why it goes from the right to the left though, these kind of timelines usually go the other way.
I love the hearts that go through from beginning to start. The colors you used really emphasize these. Black and white always works so well together. The gradually darkening background is really nicely done.
I feel like you're missing something, though, something bettween youth and old. assuming the largest one is old, due to the cane. Unless it's a real classy robot.
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