Yep, it's still going well. I don't have an estimated release time yet.
Chapter 3 is the final chapter of Greenhouse but I'd like to create other games within the same universe and other plant related content. It's "one chapter" but it's more like two chapters since it's quite a bit bigger than chapters 1 and 2 combined.
If I'd known it would take this long I would've split it into two parts.. but it's a little too late for that. It'll just be a very big update! :>