I'm a big Gravity Falls fan and your remix makes me quite ... gleeful.
It's a nice interpretation of one of my favorite cartoon themes theme (the other being the "Deththeme" from Metalocalypse and the 'Rick and Morty' theme). The dubstep elements are well done and the famous Bill Cipher quote is quite appropriate.
Like timaeus said, as long as your track reaches normal volumes, it's probably acceptable. The best way to check this is to check how it sounds next to some posted ocremixes in a similar style or genre. Even then there can be a lot of variation.
You should probably compare your work to similar, posted remixes anyway, as that'll make issues with frequency balance and some other mixing issues stand out more so you can deal with them before submitting the track.
So following the advice of mighty Gario here, I've been cleaning up and adding variety to my work, trying to make it less muddy and boring. I think i'm getting the hang of it but i'm not happy yet with the ending, it sounds strange at times (not sure if it's the melody or the mixing tho) and its still quite muddy.
Still wanted to share it though so feel free to comment !
Thanks for listening