Nice job! you've got a great start so far! The mechs overall feel pretty good. I love that your mom did artwork, thats adorable!
I think turning off texture filtering might help, since a lot of the graphics like the radar are so low res. even if they're just placeholder for now.
I think quick turn on down + shift is not great, especially without having an animation for it. I thought I was teleporting and got really confused. I would map that to something like Q or X, and have Down+Shift be a dash backwards (that's what I was trying to do anyway, not realizing I was quick turning)
I think the jump and hover are a bit too floaty. I would crank up the gravity scale and maybe try to get some more dynamic arcs to the jump. you should drop like the 100 ton brick shithouse you are when you let go.
As for weapons, I think the distinction between "primary" and "secondary" here is not nearly as important as "left" and "right", and I think it would do well to have those coincide on mouse and number keys. so lmb and 1 should control the left gun, and rmb and 2 should control the right gun, that way you don't have to mentally flip it around.
lastly, small bug, but if I'm firing the gatling gun and switch weapons mid fire, the gatling gun continues to shoot.
All that said, I like this game a lot so far and can't wait to play more! I hope this feedback helps you with development, and good luck!