Just an idea, but thought it might be interesting if there was a reward for getting off planet, like a giant laser cannon with four engines on the sides to control planetary alignment and then a charge phase timer till the beam goes off using the core of the planet as power consuming the planet while shooting off a massive laser that can half destroy a planet
I wouldn't mind a nuke-tier interplanetary artillery of some sort. Something that does scout-weapon damage, but can literally shoot one planet to another. That way, you can still pressure other planets or attempt to assist invasions onto planets. Make it just target structures though, no reason to make it hit orbitals or something.
Think like a deathstar laser, only the planet or moon it's fired from would also be consumed, destablized core resulting in implosion. it could be made where once the facility is contruscted you have X amount of time to align the planet so if you forget, and your laser misses, well guess what ROFLCOPTER on you!