I didn't listen passed no. 5 but it's my favorite one. I made a little remix to give you an idea of what I would change about the track.
Disclaimer:
This is just my opinion and I'm not a PRO by any means.... yet. Here's the link.Overrall I like the sound you have going though the mixing needs work. The bass has too much low freq and should be lifted off the floor so to speak, do that with a filter. It helps bring the kick out and keeps the bass from becoming too lost in the sound. In this mix I made the kick a little louder just cause that's what I like.
The snare is too loud and is dominating City Chaos, maybe in your other tracks too, I mainly focused on this one for detailed notes.
My Piano isn't exact and stuffs but rather listen for how things are arranged in the sound space. The snare and hi hat fit with the sound and the lead piano is a bit out front. Don't have to do this, the lead piano could be pushed back in so as not to stick out so much, it's whatever you want.
I liked the groove of the bass and I would keep it in there to let it ride. Right now it kind of pops in for a bar or two and then abruptly disappears.
The sound is a little low across the board. Pull up different tracks on like youtube or something and notice how they're a bit louder than yours.
Not sure what speakers you're using when composing but I would highly recommend listening with different sets. I use mainly headphones and when I listened in the car a lot of bass was way too loud and had too much low frequencies. Listening in different areas helps find problems like that.
Keep up the good work!