I find the NPC panels to be a little underwritten, I wish there was more character and flavour there to latch on to. Considering the 'myth vs reality' surrounding the Peartree crew, it would have been nice to have a couple sentences devoted to each of them that better flesh out their legendary deeds and how that differs from the interactions with them in person.
Similarly, the ACT structure is written in a conversational style that suggests options but does not present concrete progression or pacing. There is some suggestion to have a few encounters with the dolphin creatures, but what tools to use to differentiate them are not provided. As a consequence of this, the scenario reads as one long violent sequence.

A cursory read of the pamphlet raised a few fundamental questions. What are the PCs fixing and how can those set pieces be made dramatic? What is some of the ecology of G'sliiit? How does the submersible spaceship work?  What is the value of the sentient pearl in credits or rimworld trade?
This is especially frustrating where the text concerns the sentient pearl, its nature is vague to the point of lacking character.

Doris, however, is extremely distinct! I think the idea of being stalked across a submarine by a sentient dolphin and the alien life it is connected with is really cool.
The art design is very evocative. I especially love the map for the Peartree. 

hiya, reading this now - here are some notes i took!

i LOVE this apple ][ (or i guess Macintosh?) aesthetic. the setting even feels like it'd be something i'd play on that old machine in my uncle's office. presentation is glorious, portraits are great, map art is great, dithering on the title screen is great, the Chicago (or Chicago-like?) font a perfect touch.

THE FREAKING DOLPHIN TALKS <3 i remember the first time i read this, i read it out of order, saw the dolphin tranq gun, and thought "why would i ever want to hurt the dolphin?" and then laughing very hard when i realized why. "YOU BIPEDS ARE SHIT."

the "never meet your heroes" aspect of the crew is great, if i were running it i think i'd try to pepper in stories of their fame during other adventures before ever meeting them :)

great work. this put a big smile on my face. briefly scanned the previous comments and saw that you mentioned english is your second language -- just wanted to stress that while there are a couple of little issues here or there, the intent was clear everywhere and the sense of humour shone through!

I really enjoy the aesthetic, setting and NPC characterization. 

Could do with some further editing; Quite a lot of unused space that could be utilized, such as more detail on what Doris has access to, how the PCs might attempt to wrest back control, etc.   

So, lots of creativity on display here... sentient pearl? The ship's cute dolphin turns out to be the evil mastermind? I'm here for all that. It's maybe a little lighthearted for Mothership, but I don't mind a bit of genre-bending. Similarly, the graphical treatment of the sub is really nice for what it is, but would look out of place in a lineup of other 3P Mothership products.

I think there are some weird decisions that were made in terms of how much space and attention to spend on things.

1. The entire plot and all the threats are compressed into a single panel on the back page, while there's tons of available room elsewhere.
2. The title gets an entire panel to itself and isn't really interesting enough in design to warrant that.
3. The NPC descriptions are minimal and don't nearly use all the space available for them. If you don't want to write more about them, just make the pictures smaller and you'll have half a panel left for something else.
4. The sub map is really nice and looks like it got more love than anything else in the module, but there isn't even a box-and-line map of the external environment you're navigating through.
5. The sentient pearl is a cool idea but we're never told anything about it except that it's a pearl that's sentient. Does it grow inside a giant oyster like a normal pearl? Is the oyster a threat? If it's not made by an oyster, where does it come from? If it's sentient, how does it communicate and what does it want?

The style of writing, particularly the plot description is way too casual and stream-of-consciousness for my liking. It feels like you were just explaining the adventure to a friend out loud and got someone to transcribe your words verbatim. The written format gives you time to structure your thoughts more clearly than you would when speaking... don't waste that chance!

Anyway, it's a fun idea, but usability is low. I can see a good session coming out of this, but you're asking the Warden to do a lot of the heavy lifting because you focused on art and just kind of sketched the idea of a story around it.