Alrighty, first things first, gonna get this out of the way, no one cares about if you're gonna use it in Geometry Dash. It's cool that you're making a level out of it. Advertise it somewhere else. PLEASE I beg of it. Anyway, time to review.
Pros: A minor, C, F, G chord progression huh? i, III, VI, VII progression. Loving that. I honestly have emotions listening to it. It... kinda makes me tear up. This is a pretty damn good song. I think the Saw wave synth sounds awesome. It's a kind of electro synth that I want really badly. And the basses during drops sound so wet it makes my mouth water. True story xD The drums sound absolutely huge and full. I think this is the best song of 2016, but of course, there are some gripes.
Cons: The first thing I have to note is the clipping during the drops. My god does it clip. You don't even need to know a single thing about music to tell that there are some frequencies that have been clipped. It's noisy and kinda makes it hard to listen to. Next is, while it has one of my favorite melodies ever written, it's incredibly repetitive. Some nice variations during the drops would have made this one epic song, but it is backed up by the melody. And, finally is... well... for lack of better words, use in GD. I used to play the game and made a couple levels using this song, but since it's been three years since the last update, I don't understand why it's constantly mentioned in NG comments. It's died, let it die. I hate receiving comments on my music about use in GD, to the point that I've become outright angry when people mention it. I'm just like 'Can you not bring it up? If you do... grraaaaaaah *explodes*'. Yeah, not a fan. I've become another Xtrullor. So yeah
Overall great song. I do admit some of this stuff was... biased, but I've subtracted the bias from the rating, and out came the 4/5. Glad you made this dude!