Alternate "gameboard" elements are really needed . since at this point the game is nice but lack luster and this could hurt Longevity of the game.
- A small moon could be a large military base OR a commerce center OR a mining operation etc. You only get one pick so pick well [and it can be leveled up over time?]
- Lots of “small” asteroids in a system could force all ship movement to slow. (simple modifier)
- A gas planet may have a primary moon, colonizeable and some minor moons. A bigger well also
- Rings could force structures to be put farther from planet.
- More variation in planet size. and type modifications . . (ocean planet may not have allot of habitable locations, Volcanic a boost in mining, etc)
- Strange planets . . some spice

( a tidally locked planet – one that does not rotate . . 1/2 frozen and 1/2 burning 2 bonuses?, Binary planet 2 of the same small size or one normal with a habitable moon, etc )
- A planet with a one way or intermittent extra jump point.
These elements could change the tactics quite a bit per system . .as it is now after you crack one system you have cracked them all and simply it can become boring rather quickly.
Also I would add more then 2 types of defense platforms - and allow them to move, too slow for tactical use but fast enough for strategic use. (for example a fleet is staging for an attack on your system and you scout it out, move your platforms into a defensive position assuming that the attack will come from that jump area . . the defenses start there slow move . . [they get there in time and help greatly in the defense] alternately [it was all a distraction and a fast raid pops in from another jump point – all of the guns are in the wrong position to save the research and mining platforms]