Hi there @wingx
Yep, as @druce mentioned, nice idea there and already some good results if it's a 4th track
You did well with the mastering, you're reaching around -10 db for the Avg RMS with around 9 dB of Dynamic Range ( might even be more on your original file since I got those values passing the audio in from SndCld to a stereo input here, and it's therefore based on a MP3 file which I then converted to a 44100 16 bit Wav file ).
Now IMO the issue I could point won't be about more side-chain or a lack of sub, for me it's the opposite way, your kick is a tiny bit too loud but it's more the higher frequencies causing the issue. I would try to filter those high frequencies before they hit the limiter and reduce the kick & beat in level.
You can then try to use compression but not with side-chain, you need to use it to glue the mix, that's where filtering the highs should help because they arm the track when hitting the limiter ).
Another thing is that you have some elements slightly not tuned, like the arpeggio bells starting in the intro and the vocals, on one end it creates an effect but again passing through your mastering chain, it gives more unbalanced harmonics. You also used quite a bit of saturation/distortion, nice effect as well, but to use with moderation. If you crank up your mix a little bit more it will sound distorted.
For the elements out of tune here is something I sometime do ( don't know your DAW but I'll explain in Live ) :
I render the final mix from the master channel and reload it in Live, I warp the file using the "Complex Pro" algorithm which is the most musical & retain the most harmonics. Once done I play with the "transpose" setting in the audio editor windows & pitch down at -5 , -7 & -12 Semi Tones. If you have too much out of tune elements, it makes it more obvious to point tuning issues that way.
Some other things that comes to my ears is the use of reverb, Mid/Side Eq & filtering before hitting the reverb is your friend here, sometime a delay with a plate or a spring reverb is more nice than a classic bigger room reverb effect, especially on vocals. But well, it's also a question of taste and the effect you want to give to your track of course. And that said, I don't cope with the vocals , I would rather pitched them down or use something else for my liking.
But yes, good work and already good results here, keep it on !
Maybe you want to check this one if you haven't done yet : https://www.sonicacademy.com/courses/creating-wide-mixes-with-protoculture
Hope that helps, cheers !