I agree with the other comment—a coyote time mechanic would really elevate this idea and make the platforming feel smoother.
Also, here are some fun concepts you could explore if you keep working on the game:
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Incorporate the eraser more—maybe as a tool to delete hazards or clear parts of the level.
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Give the pencil extra powers, like drawing walls to trap enemies or creating new paths for the lightbulb.
Overall, this is a really good game and I love the little character!