There isn't enough space between the sub notes and it makes it sound like 1 big sub note, you want your sub to sound like an extension of your "WUBZ"
The vocal fade in thing right before the drop sound as loud (or possibly louder) than the bass sounds and takes a way a lot of the impact.
Drums are pretty nice though, I do have to say.
Consider turning the bass sounds up a bit more (but not the sub), it lacks of overall impact compared to the other elements in the drop. You made your sub nice and loud which is is good, however the presence of it is a bit lacking, probably because of the first issue I brought up.
My biggest suggestion is compare it more to a song you like or that sounds somewhat similar to yours, and get the mix as close as you can. Really take some extra time focusing on the mix. Even compare it to multiple songs.
Your song is already released so you most likely won't be fixing it now, but take this with you for your next.
Also if you plan on allowing downloads on your songs in the future, please upload them as MP3, not many people like collections of large WAV files or having to convert it to MP3 themselves.
Overall good song my dude, I want to hear more in the future!