What I really like in single player only games
make it fun
A ship to receive medals upon completing a mission gives you joy and and attachment which make the game more enjoyable. Also I really enjoy when lets say one of my ships gets a weapon ugrade for eg. every 3 missions making the unit stronger and powerfull.
If the ships that surive missions do not get medals and no weapon ugrade than there is no personal attachement and the game becomes less enjoyable.
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