For someone who is 12 years old, this is insanely impressive. You certainly have a knack for level design and game feel - for example making the screen shake on every landing, and making the background a checkerboard pattern so that you never get lost are very smart decisions, as well as your ability to string together 20 whole levels that feel completely unique. It's astounding. You could have probably integrated the theme a bit better, and the game does get a bit too hard at times (I would suggest making the purple orbs a bit more consistent), but overall it's very fun and a GREAT start. I would tell you what games I was making at 12 years old to compare, but I would be way too embarrassed.