Proposed modifications:

In Game music

Unique levels 

New Obstacles

Download

Download
Windows 2D Platformer.zip 29 MB
Download
MacOS 2D Platformer.zip 29 MB

Comments

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Your proposed modifications sound like they can be significant just make sure that your new levels are varied from each other in how they play, your new music is created by you, and your new obstacles are something new you have created.