I'm not sure where the backing track came from but the piano is pretty average and plonky - and you can't change anything? That's because it's just you singing against a backing track, right?
I listened to this because, even though I hate musicals with a passion, Julie Covington nailing "and as for fortune and as FOR FAME" is a "hairs on the back of the neck" moment in music, but I felt nothing at all when you got there - I had to go track down the Julie version to see if I was remembering correctly. I was.
You clearly have a set of lungs and pipes that most would kill for but I'd say in places you're over-singing a little and in others you're under-singing and there are some pronunciation issues here (ie. "my mad existence" is missing the "sssss" at the end) and there. I get it. Croatia. Not your native language. But...
It's a song of great subtlety, and in one spot, picked more or less at random, where there's nuance and a plaintive air in the original ("You won't believe me, all you will see is a girl you once knew"), in those words you're a little powerful and the emotion inherent in the words is lost - and I came away from the whole thing thinking "competent" where I wanted to think "transcendent".
There's a place or two where the vocal could come up a little, but mainly the levels are good.
I feel strange critiquing someone who can sing far better than most could ever hope to, but you're attempting the classics here - this is a hard, hard song, so I hope you take my criticism in the spirit it's meant.
Feel completely free to ignore me.