The energy connection system is flawed. When I have 3 Solar Stations connected together, I expect the other buildings to draw energy from all of them; not just take from the central station and then ultimately fall short of energy.
Apart from what others said about upgrade tips, DO NOT repair your ship whenever money is available! Wait for 50k and then repair all at a time. Otherwise, there won't be as many monsters as needed for 50k.
Why is there no Help section like there was in the previous games? There are a bunch of new units in this game & I would love to know about those in details.
The amount of time I've accidentally fallen through the hole without killing the boss or picking up the loots is too damn high.. Maybe a lid on the hole which opens only after killing boss.