Finally there needs to be something to spend your scrap on once you get 3 very upgraded strong ships. Perhaps a 4th ship slot or a few really powerful weapons that are really expensive. I'm not really sure of the best way to handle this but it's a bit frustrating to have 18,000 scrap with nothing to spend it on but be barely surviving each combat because the enemy keeps getting stronger each level and you have already maxed everything out. I suppose being able to trade scrap for upgrades could help with this as the curve on those is so high its near impossible to completely max out all upgrades on everything.
Another idea would be to have teleport of escape pods that fit in the fixed (blue) slots but cost more scrap as this would allow the trade off of scrap cost verses losing the more valuable rotating (red) slot.
