This looks to be the first of Jon Blows games to put writing front and center, so I wonder if the clunkiness goes beyond the trailer. That's not really his forte.
But I do think that the writing was fairly central to the intended experience and design of the game.
I think a 'number of features' metric can work but only for players that already know and like your game, where an expansion with 'Five exciting new areas' is understood as something that they'd enjoy, and I agree it feels odd for a new IP.
Similarly, saying how many years it took isn't remotely a selling point for a new player. If you'd been following the development process then you probably wouldn't care, and if you hadn't you also probably wouldn't care.
It does seem awkward to have to design a trailer for a pure puzzle game, something that essentially relies on things going on inside a player's mind for fun, which by definition won't be visible.
Baba Is You did have something you can show potential players, but I'm not sure there's a trailer that could convey The Witness' 'Oh, I wonder if I can...' moment as it's a very internal experience that comes from playing enough to get to that point.
The Witness was, however, visually beautiful (IMO) and its symbol-based language let the trailer keep an element of mystery and intrigue. Order of the Sinking Star, while potentially also a fantastic puzzle game, seems to not be able to hide anything by nature of it being very clearly a Sokoban-like. Even if there are as-yet-unseen depths to how it treats the Sokoban format, the trailer needs something to work with, and while I think it also looks lovely it perhaps doesn't have the The Witness visual appeal or mystery to draw people in.
Note that when masters like Steve Jobs do it, they mention it very quickly, or they mention the ideals of craftsmen ship, rather than the actual process.
I'm getting "bring your adventure" vibe, similar to The Witness.
Take Thomas Was Alone for example - seemingly simple platform puzzle game with deep and engaging story where you're more interested about characters than new mechanics and puzzles.
In contrast The Witness could be scraped to core puzzles and released as an iPad game for $5.99, but the whimsical island and scattered pseudo intellectual voice clips make it so much more giving you opportunity to pause and think about life.
This seems very similar. A sokoban puzzle game with an entirely optional plot line that leaves a lot for interpretation by the player.