Terrific feedback already given by D.A.
With the correct formatting this script would be much less than the 15 pages it appears to be and I feel your script/story would be much more effective for it.
This below is description. It's too long to be a parenthetical (wrylie).
(yawning, his voice tinged with exhaustion)
(yawning) would say it all, if it is needed.
It also should be formatted under the character name, centred, not left justified, no line break.
Example:
Tsie
(yawns)
Wake me up when we're
ready for...
Some links below re Parenthetical use.
https://freshmenscreenplay.com.....ay%20by%20placing%20(brackets,Can%20I%20talk%20to%20you%3F
https://www.movieoutline.com/articles/writing-parentheticals-and-wrylies-in-your-screenplay.htmlhttps://johnaugust.com/2003/using-parentheticalsParentheticals are specifically needed, if for example, it's a group scene and we're unsure who the dialogue is directed to but otherwise you want to use them sparingly.
You are also over describing things:
Tsie and Uncle Aron stand before a vintage Chevrolet Corvette the 'Old Barkie', the weathered vehicle that will be their steadfast companion on this journey. . The sun shines brightly overhead, causing the faded paint (paintwork) on the Barkie's exteriorto glisten with a hint of nostalgia. Tsie runs his fingers along the dents and scratches, feeling the rough texture beneath his touch. It's a testament to the many miles and stories this car holds.All this sentiment is lovely but too much and it's more befitting a novel.
Put inverted commas around the name given affectionately to the car, and Cap it as you would a character name. Give us the make of the car so we can picture it. I put one in there as an example.
You can condense the description, but still retain the nostalgic feel.
I blocked out a few words as an example of what you don't really need. You do your own editing but these are suggestions.
Take heed of D.A.s advice re formatting.
You use parenthesis [ and ] around some description passages and it's not standard, not needed. And brackets ( ) elsewhere. Writing Action and Description lines stand alone without those.
Example of unwanted parenthesis:
[As they approach the border, a sudden loud noise startles them, breaking the rhythm of their conversation. The sound reverberates through the car, a jarring interruption in the harmony of their journey.]
As D.A. pointed out, you're taking too many shortcuts.
Example:
After the call, Tsie decides to take a nap while Aron contemplates his plan, grinning at the comical turn
of events.What would we see on film here? If we see Tsie napping you need to show that - complete with scene heading. What are we looking at in that description of Aron? I suspect you're used to writing novels or short stories. You need to write what we're seeing on screen at any given moment.
Free Screenwriting software.
https://www.scriptreaderpro.com/free-screenwriting-software/I'd start with Trelby. It's free and easy to use.
Get the nuts and bolts of screenwriting down pat.
That said, some beautiful writing on display and I hope to see more of your work.
The hot, dry wind whistles through the barren landscape, carrying with it an eerie silence that hangs
heavy in the air. The distant sound of cawing crows echoes ominously.Maybe replace 'eerie silence' with eerie foreboding, or similar.
Anyway, enough from me.