Couple things i noted:
1. Add confirmation to selling things
2. Highlight or forbid selling of equiped ships/turrets
3. We could use some explanation for added mods
Excellent game, making me want to explore anything just before starting missions themselves. Quite open world, nice design. It also reminds me GTA in some way (despite being non gangster game and being 2D). In other words 5/5.
WARNING SPOILER
It has been already said many times that Rift Demons are overpowered but nobody has compared it to other races:
Dark Rift cost none; +1 elemental/dark / enemy -1 energy - D. Energy Tower () COST 2; +1 dark / enemy -1 energy
Nebular Rift cost none; +1 dark/nebular, 1 random damage - Flak Cannon COST 3; 2 random damage no energy production
Gravitational Rift cost none; +1 grav/elemental, +1HP - Hivemind Fusor +1 fusion, + 1HP
Energy Rift cost 2 (+1 when built) +2 elemental (no other building like this owned by other races)
This is definitely imbalanced as basic buildings of this race are like elite buildings of others. Also Rift Demons have too many elite units (8 while average is slightly over 2). I hope that if there's next version of this game, it will be fixed.