I've watched a few of these Korean BL that have been coming out in the past couple of years. So far none of them were perfect - the plot was underutilized or full of holes, the characters weren't well built, or there wasn't chemistry, but usually there's at least one of these things that is well-made. That's not the case for Color Rush.
I'm probably biased because I've only heard good things about Color Rush, so I was looking forward to watch it, but the only merit I can give it is the fact that, somehow, I managed to watch the entire thing without quitting out of frustration.

First of all, the plot felt pretty inconsistent. I'm willing to give the unanswered questions about the Mono/Probe theme and Yeon Woo's mother the benefit of the doubt, just because the second season has already been announced, but all the other things don't work together all that much. There are characters that seem underutilized and I questioned their decisions, their words and their actions multiple times as I watched - in more than one instance I felt like the driving force behind the story was "this is being said and this other thing is happening because this is what the plot wants".

The characters were disappointing too. Yeon Woo seems to not have a life, thoughts, or a personality that doesn't revolve around being Mono: no hobbies, no dream job, no passions, nothing at all. Yoo Han is introduced as a trainee, but he's never seen during practice and seems to have a lot of time on his hands for someone who is supposed to be a trainee and to study at the same time. A big chunk of the interactions between the two are just long, uncomfortable stares. I don't get why are those supposed to be useful for the sake of the plot or even just the development of the relationship between them. The acting didn't help, especially for Yoo Han: many lines of his felt like he was just repeating his share of the script out loud.
The classmates and Yeon Woo's aunt seemed like interesting characters with a lot of potential, but they were barely utilized at all despite their potential, even when there were excellent occasions for them to get more spotlight.

I wish I could say that this story needed more time, but that would be a lie. It was 2 hours long and I believe that several scenes could have been paced much better to leave room for other things.
I'm going to watch the sequel to see if the story overall can be saved, but right now I only feel like I wasted my time.

I can only recommend it in case you're a fan of that specific "colorblind soulmate AU" kind of story, but other than that I suggest you looking for something else.