Having played the first game quite a lot but had to give up on it because of bugs, clunky UI, non working rules which were crucial for the game to be playable at all and performance issues.
Which was sad because I really like management games with porn focus and the games actually are management games having the tag on F95Zone are very few. (for some reason relationship point grind games fall under this category)
From what I gather in the current version this game is very bare bone and doesn't add much except the looks of things.
In a distant future, what will differ between the two games?
I kind of had to start over to address all of that stuff.
The big changes from 1 to 2 are:
Larger scale: I get smooth framerates with around 5k people on the station, and livable framerates with around 10k. That was impossible in 1. Buildings are now more Sim-City than Dungeon Keeper (though I plan to make this part of progression in the research update, so you'll start out building smaller buildings, then work your way up). The station also exists across multiple decks, which each have a different theme.
Better story: More interesting characters, and more cinematic cutscenes. I'm a better writer now, and it shows. They also use AI instead of 3D art, which allows for characters to do things other than "sitting" or "fucking" (each 3D environment in SM1 took me hours to make, so there weren't many of them).
Fewer bugs. While there is definitely jank at the edges, it's nowhere near as bad as SM1. The core architecture is a lot more solid.
Automation emphasis: There are now (optional) continuous sources of slaves, and you don't necessarily have to interact with each one. This lets you set up pretty elaborate money-making machines in the rules assistant without having to micromanage them.
Better UI: UI in 2 is designed rather than evolved, and makes a lot more sense overall.
Graphics: The station art is significantly improved. Character art is getting there (currently, it's a mixed bag. Some people like it, some people don't).
The planned differences (mostly things missing from 1) are:
More slave options: Furries, full gender spectrum for the player and slaves, and augments are all in the pipeline.
More construction options: The fighting pit and research aren't available yet, but I plan to add those in a patch pretty soon, along with a bunch of other new structures.
New combat. The current combat system in SM2 is placeholder. There's already more of a tactical component, (your ships don't just always leave from your station, and have to move through the galaxy), but there is more coming on that front. Something like a (very) stripped down Sins of a Solar Empire.
More interactions: Currently, the only sex positions are missionary variants, and the bondage toys aren't in yet. Both need to be expanded.
Better slave art: I developed a novel character engine for this game, and it's still a bit experimental. It still needs another pass or two to be where I want it to be, but it's serviceable as is.