Great game. One thing I notice is that you can run into a situation where you buy a new ship, but the station you are at doesn't sell your old one. When this happens you cant sell off your old ship. Even if you could scrap it it would be ok, but there is no way to get rid of it.
There should be a way to sell extra supplies that you don't want. I'd love to sell off some of my speed boosts and use the money to buy mines/damage/armor. Even if it was at 50%.
What about the possibility to shoot/destroy supplies that are on the ground or falling. Different supplies would have a different effect when hit. For example, Energy up supply would explode when shot dealing damage to nearby tanks. Shooting a double armor could damage it making it disappear or be only partially effective.