For non-porn, Starsector. It's a near-perfect game in my eyes, barring two things. First, I despise arbitrary level caps, so I'd like that to be done away with. Make leveling up more difficult if you don't want the players to get too powerful too quickly, but don't artificially restrict the number of benefits I'm able to accrue over the course of my campaign. Second, tone down the colony crisis mechanic. That thing kicks my ass when three separate factions invade my system to lay waste to my planets and I barely have a security force because I'm just starting out on colonisation. Even the best defensive base in the game does jack against thirty separate armada-size fleets bearing down on a lone world.