This song isn't bad there are just a few things I would like to point out tho
I will tell you this now Nexus will only get you so far. It is a great tool for starters and its alright to use but not for the main course of the song. This might be more of a personal opinion but when I hear a song made with mostly nexus I find it shows a slight bit of laziness or maybe that you don't know some of the great tools out there other then nexus. And maybe no so much in this song but I have heard a lot of Nexus in you songs and it might help further this music thing If you start to explore more.
Now about this song in general.
you kick is clipping not to bad tho just need to be turned down some but also turn up some on the lower frequencies. there does seem to be a slight conflict between your kick and your bass and that they are both on the same frequency and this is a common problem and can sometimes take hours or even days to perfect because generally bass and kicks in a lower frequency and It usually just takes a bit of fine tuning to help distinguish them.
the synth that comes at :44 is sorta fuzzy and kinda hurts the ears I suggest just lowering some of the higher frequencies I also think that this over powers the rest of the song. if you listen at 1:15 you can hear how the bass seems like the volume gets lower as the sythn gets louder. I would suggest focusing you synths more to the mid frequencies and you bass more low
Lastly your piano. I will tell you now that nexus pianos are the worst well not the worst but pretty bad I would suggest looking into 4Front Pianos and Truepianos maybe even look into soundfonts.
I want you to know this is not me attacking you but more a less trying to help.
If you have any question about any of the terms I used in my review or EQing Compressing just PM me on Newgrounds I will give you my email And I can answer any questions you have
I would like to point out on a good note I think you have potential and I don't think this song is bad I think its built well with good melody its more the quality I am concerned with.
Well anyways Have A Great Day :)