Have you seen Mindwarp? OK, you can skip this one, just know that this is where C'Rizz comes from and you're set to continue the Divergent Universe arc.

Philip has some trappings in his stories, and they can be pretty off-putting. He likes writing over-the-top violence, especially against women, and specifically body horror is almost certainly a fetish of his, given it pops up in BOTH of his TV stories and again here, more violent and horrifying than ever.

I will give him props that none of the women in Mission to Magnus have their bodies taken away from them. No, instead they're all belittled for being misandrists and the big strong men come along to force them to be their wives, which the Doctor approves of. What's the moral here?
But you know what else is in both of his TV stories AND Mission to Magnus? Sil. Big corporate interest, doesn't care about lives if they can't profit him? Yeah, Martin's most well-known villain is a businessman.
He recycles that, here, too.
The Kromon are all bland and uninteresting. They probably had names but I can't tell you any of them. They all blur into one big "what if businessmen were slightly more evil", with a twist of the story being that their slave encampments are built off literal company directives.
I will say that it's a slightly interesting idea. They're based on insects, many of whom have one queen and a bunch of worker drones, so depicting them all as almost mindless drones following the corporate directives could work... if it didn't feel like such a retread.

Had this been Philip's ONLY contribution to Who I'd probably view it more favorably, but every piece of context I glean from his other works just makes it worse and worse.
But don't worry: there is a new and exciting way he found to fumble something interesting.
C'Rizz is the newest companion, and for a lot of the story he's kind of fleshed out. Guy with a heart of gold, wants to help his people, horrified by evil monsters, friend to the Oroog, can't leave anyone in danger... We've seen it before, but it's a good start. What fumbles it for me is the end of the story. C'Rizz talks about having been selected, but neglects to mention anything before that. At the end of the story the Kro'Ka shows up and says "yeah he was a pacifist monk". Why wasn't that IN the story? Have him grapple with it!
The Kro'Ka then starts going off on the Doctor saying that he's the one who weaponised C'Rizz and that he should think on that... So essentially, Philip seems to have been given a character brief and an emotional arc, then pawned it off on the next write because he didn't want it

Speaking of emotional arcs, remember Scherzo? It ends 30 seconds before this one starts? Well, let's just ignore it. No mention of the big revelation of the Doctor and Charley openly admitting they're in love, no, time for a standard Doctor-companion pair. If it weren't for the Kromon going "time travel? What is 'time'?" (and a companion introduction), you'd be forgiven for thinking this was a random extra story set between, say, Minuet in Hell and Invaders from Mars.

In a point in time where Doctor Who is trying to be more experimental and focus on arcs and character more than ever before, Philip Martin paints a dreadfully by-the-numbers story with little memorable about it other than slurping noises.