It's weird that mine after get her out of prison, her option still said become couple, not friend with benefits
There are a few misconceptions out there about how the game's mechanics work. Your potential relationship with Primrose is influenced by her ending up in prison or not, but it's not
decided by this event. LLtP tracks your relationships through numbers that grow and shrink based on your choices. The jail event affects these numbers, but other choices you've made can offset this. It's easier to think of these events in a more realistic fashion: If Primrose really likes you, she'll want to be your girlfriend. If she doesn't like you quite that much, she will only want to be friends with benefits. Once you get one of these offers, she will not offer the other one under any circumstance. You may also reject her entirely.
I swear I saw sometimes ago this game and it was more than 0.15
Only if you consider 0.15 to be a decimal number. If you use the whole version number, it'll make more sense. We are currently at version 0.15.0, which is greater than 0.14.0, which is greater than 0.9.0, and so on. There's some confusion because I hadn't fully landed at a versioning system for the game's first three updates, but it's been more than a year since that.
One more important question. Is this game really time sensitive or can I take my sweet ass time doing whatever I wish.
It will be time sensitive when it's complete (but not punishing in its urgency). Right now it's not, but there is a single event that will put you under (generous) time restraints. It will make sure you're aware of this, so there's no risk that you'll miss it.