That is a game seemingly in progress for 5-6 years, and still working on it?

Yep, that version gets occasional maintenance updates and we released the Remastered FREE version to all owners some time ago and the FSR version is getting a major update soon too.

A game that just came out, and that's complete or also still working on it?

It's about to get a major update released as well (in a few days or so). There are a few more content updates planned for it.

And then a third game working on it?

Dire is about to get our full attention once the next FSH and FSR updates are out. It's actually already in late development itself but had a break in focus.

Why i said why not finish and close things before jumping to a new game.

That is generally good advice. My development philosophy is to make games which complement each other in development times. So development on a single game boosts the development of some other games. So naturally some games get some development done while others are being made because they share various elements. We still try to focus one thing at a time. We will probably never "close" a game and say it will never get a new update.