Vylent

I like this one a lot! It reminds me of the classic jungle d&b tracks that you don't hear too much in videogame OSTs anymore. I've really no critiques, it's a good jam!

Hey Vylent!
As was mentioned in the live feedback, having space between vocal phrases is helpful for the listener to digest what the vocal passage is doing and saying. The guitar lead in the older version is a great example of creating that space between the vocal phrases!
The intro in the older version has a stronger build than the current, though it goes without saying that your vocalist, Sirenstar, is absolutely wiping the floor with the AI vocal. Returning the levels to the drums on the out (as in the older mix) would better realize the vision of getting this mix close to Imagine Dragons.
There’s some rough cutting on the vocals around 2:44, and the breath coming in around 2:48, 2:52 is a bit hot.
I think that’s most of the feedback from last night! I am really looking forward to hearing this get polished and see it get submitted!!

Hello, I'm sharing a wip for a remix of Tomorrow and Tomorrow after receiving live feedback on the OCremix discord.
The goal was to mimic the style of Imagine Dragons (ie Warriors)
Source from 0:00 - 1:05 of 
 
and below is a earlier wip to compare changes I've made (for better or worse)
 

Hello, I'm sharing a wip for a remix of Tomorrow and Tomorrow after receiving live feedback on the OCremix discord.
The goal was to mimic the style of Imagine Dragons (ie Warriors)
Source from 0:00 - 1:05 of 
 
and below is a earlier wip to compare changes I've made (for better or worse)
 

First off, thank you for formatting your post in the way that you did, it's very helpful to include the sources and timestamps like that.
On to your bullet points, I'd like to talk about those.
You're asking yourself the right questions, in the way to help be self-critical.  Being self-critical is a very difficult skill to develop.  So, asking these questions and thinking in this manner is a good place to start.
On the first point, low quality instruments.  You are correct, they are very low quality and sound very much like basic MIDI.  This is most apparent in the guitars.  Guitars are among the most difficult instrument to make sound realistic, especially when starting with basic sounds.  The only things I could recommend would be to invest in some quality guitar samples (Impact Soundworks comes to mind on that, IE Shreddage), or search for a guitar player willing to work with you and record the parts.
"Too much to my individual tastes".  I'm not sure what you mean by this.  Do you mean that your arrangement won't be liked by others because it's in your own style?  Nonsense!  Besides, you should be writing for yourself, and not for others (Unless you're getting paid to do it! :P)  Don't worry about what others think, do it because it is fun to you or brings you joy.
As far as the percussion, I can barely make it out because it's much quieter then everything else in the mix.  If you think that it's repetitive, it likely is.  Trust your instincts.
Koi-iro Master Spark is only used for 24 of 162 seconds.  I don't know how to call that too long, you really bounce from source to source so quickly that the listener is barely orienting themselves to a new section before it changes again.
Look for other tracks/remixes/songs that you want your work to sound like, and try to emulate that.  Listen to them side-by-side and note the differences, see what you can change to make your work sound more like the other ones.  Experiment, and try new things.  It is possible to learn and improve, it does take time and practice though.
General thoughts on the track itself:
0:36 sounds like it may be a key change, and that change itself is not prepared so it feels sudden when it happens.  This is in the source for Koi-iro Master Spark, maybe best not to use that part of the track due to the direct and sudden key change?  Throughout the track there's a lot of muddiness and general imbalance of levels between the parts.  I can't really make out what the bass is doing, and the drums are buried most of the time.  The guitar parts and organ-like sound dominate most of the track.  Let them work together to create cohesion and support between all parts.
Generally in medleys the represented ideas usually are developed and not just hopped on for brief moments.  With how quickly each source is visited in this, I get the impression of disjointedness rather then cohesion.  I'd really suggest taking a step back and evaluating what you're going for and do that comparison to other tracks to get the production to a place where it needs to be, then go wild with the arrangement and making medleys.