1 - I think past some point difficult must be increased. Like rent going up until let's say 50.000, PC breaking, viruses/sickness, random accidents, MOD dealer scamming u (autosaving). After some time u just sit in a pile of money with no "challenge", I think this would increase gameplay time
2 - 1 or 2 more poses to stream (but everyone above already said it)
3 - I LOVE the module system! So here's few ideas with prices:
MODS: New modules for boobs (none/tiny/small/regular/big/gigantic) $$$$$ (1M)
MODS: New modules for hairstyle $$$ (200K)
MODS: Modules to change size of robot (small/normal/tall) $$$$$$ (3M)
MODS: Tails (cat, lizzard, bunny) and ears(like the catgirl) options $$ (50K)
MODS: Personality System chipsets that changes conversation and response while fricking (lovely, sad, angry, wh*re, tsundere, none) $$$$$$$ (10M)
I can't wait to see the future updates of this game! 10/10