Ive kind of always wanted a game that mixed orbital/interstellar ship to ship warfare with planetary invasions including land, air and sea combat, at both a grand strategy and first person combat level. Like a 4x space game kinda like stellaris, but with better tactical options where you can give individual ships orders during combat, not just fleet wide, and ground warfare that is rendered and dependent on vehicles and infantry you brought with you. instead of just plopping armies down on the planet and watching their health go down you can actually make decisions on the battlefield, and take control of any one of your units. And where you could design your space and planetary units in depth and describe their desired behaviors
Its like a stupid tall order and probably nobodies ever gonna make a game like that, but its the sort of awesome i wish i could play.
I keep dreaming about this:
Taros Campaign, The Game.
Blend Battlefleet Gothic Armada, Blitzkrieg, CoH, Total War/Paradox games, put it on the oven and let it rise till the space stategic map covers the whole system and the ground map covers the whole planet, cool it off with moldability and serve at taste with tons of money.
I imagine you get the call as Lord High Commander Otto Ivan Gustavus to prepare the attack, the first part of the game would be you spending a set amount of requisition (which varies with difficult) on selecting which regiments will compose your army and a bare minimum of space ships, also there could be "influence points" which could be used to request forces from other arms of the Imperium, extra Imperial Navy, SM, Mechanicus.... Random events in this stage could rise or low your requisition and influence, troops could be available immediately at the start of the game or not... and so forth.
After all that you make up the composition of your army and it's corps, and to strike the sand!
First the space strategic map, your ships arrive and you must do battle, (or not) until you reach Taros in the style of Armada if two fleets encounter. Then you land your troops and the land strategic map unravels like those of paradox/total war. When armies collide you play it out with maps like Blitzkrieg and CoH.
Random events, enemy ships arriving, reinforcements arriving or not could make each gameplay different. You could try to emulate the campaign to the letter or you could try to do something way different. Choose another officers which would give other bonuses, other corps, more space marine companies, whatever you can....
Then you can play as the Tau too.
Finally add a scenario editor and introduce other races and factions and you got yourself the ultimate Warhammer 40k game that would put an end to all wars!