This was really neat, I love the fallout-esque aesthetic and map view and just the complexity for a jam game is certainly something!
Though i admit the game felt a little too confusing in just understanding the gameplay loop. At first I didn't know that my homebase was my homebase on the map, I assumed it was a scrap indication, and then I was very confused at why my mech disappeared. And then I was further confused by the fact I had to return to base with scrap, but frankly I just misread the description. I also thought the gameplay was a little too slow, until I realized I could hold down the spacebar.
By the way my number one suggestion right now is to list holding down spacebar to speed up the game as a control option on the game page.
The animation for the mech being deployed EVERY time a mech is launched get's really repetitive when I have to do any time I get some scrap, and I can only get 20 scrap per run.
The map exploration felt a little odd, the grid didn't seem quite aligned, and I think the AStar navigation was a little mismatched. Sometimes I could go right through rocks, sometimes I couldn't walk over seemingly clear areas. In fact one time one of my mechs was stuck and couldn't move at all.
And also I didn't see any enemies at any point, maybe that's a bug? here's what my map looked like by the time I gave up.

And as my final piece of constructive feedback, the game map is a little too zoomed out for my tastes, had to lean into the screen to see scrap piles at one point, and I couldn't find any control for zooming in.
But back to the positives, again the vibes are immaculate, and I like the concept of this game. Doing a pseudo RTS in a game jam is no easy feat by any stretch, so good work on that front!
There's a lot to love here and the core is good, but there's some edges I think could be sanded down in the future. Excellent work!