First off, loved your game/what it looks like it will become!

Need to be able to click through the money and scraps ticking after a mission completion. Having to wait 10-15 seconds to refuel and continue my route is annoying (RIP my attention span for complaining about 10 seconds of downtime)

More subtle rotation in the builder would be nice. Keeping it to 90 degree intervals hurt the creativity (I'm a Kerbal Space Program nerd, so getting inspiration from their UI in the spaceplane hanger is what I would recommend, but idk if building a version of Kerbal is what you want from this)

A difficulty option to improve replay-ability would be cool. After finding the meta/understanding the quirks of the physics engine, it is hard to want to pick it up again. Such an option would also improve the challenge for those with more experience in this type of a game (think harsher penalty for hard landings/sledding down hills/being off the runway (maybe nerf gear weight limit off the runway?), less funds/higher cargo requirement/heavier weight/cost for taking cargo to discourage low success rate flights, full map scale increase for longer flights)

Airbrakes should still work on the ground. For my bigger craft, I had to stall above the runway using the airbrakes and just drop. Otherwise my engines couldn't stop me in time. Never used the parachute, so this one might just be a skill issue.

Not as necessary given the physics isn't too punishing, but a center of lift marker like the center of mass would be great for balancing everything out