Big post on the status of progress so far, what follows is a shameless copy-pasta from
http://knucklecracker.com/blog/index.php/2016/04/particle-fleet-status-april-2016/

"
Current Status
Game play rules are 95% done. There may be some tweaking, but the major pieces are in place and I’m fairly happy with them. I’ll be really happy with them once they are balanced some more.
Graphics are mostly done. I may still tweak a few effects here and there and change/add some land textures. But for the most part what you see in the next video or screenshots is what the game will look like. Yes, it is definitely ‘indie’, but it does also use a little bit of your GPU for lighting effects and such. Also my games always tend to err on the side of packing in more ‘information’ on the screen than trying to make pretty box art. That’s just the way it is because that’s what I like.
Operations (things the software has to do to work, like menus, selection screens, persistence, settings…) is well over 90% done for the critical elements necessary. There are more things I’d like to add, though, so see below for that.
Scripting, custom images, and other mod support is 60% done. I have PRPL (which is like CRPL) and it works and is being used already. There is also custom image support so you can insert your own graphics into a mission. There is a ship editor for making your own ships (and using them in any mission). There is a map editor, but it needs a few additions. I don’t have scripting on ships yet, or custom character graphics, or custom land texture support. But I will be adding these soon.
Content is hard to assess. For the story missions I have just begun, but I do have a story draft. There is the simulacrum random mission generator and it is over 90% done. Custom mission support is also over 90% done and there is an editor, a way to play and post scores, and upload missions for sharing. The game also has a “Mission Heap” (like Colonial Space in CW3) for browsing and downloading maps (that can be rated). I still need to add the majority of the story missions, plus some other missions created during development from me and others.

Things TODO
I’m currently working on PRPL (scripting) and enhancing it a tad. I’ve been making a tutorial mission so cleaning up and improving PRPL is a current work item.
Story missions. Working on the tutorial currently (which takes like 2 weeks… but I’m 90% done with it).
Better story mission selection screen. (Currently better than it was, but needs a final adjustment)
New main menu section for viewing missions created during development for testing and game play.
The ship editor exists but there is no online sharing of ships at KnuckleCracker.com yet. I want to add a way to share and browse ships.
Scripting on ships. Need to add a handful of ship specific APIs.
Corporate “logo” (a small icon) support in high score tables (the ability for players to have a custom icon next to their name). More on this later…
Review tech upgrades and adjust/add/remove as necessary. This has a lot to do with balance and some things only reveal themselves after considerable game testing.
Small graphical updates here and there. (I got some grief on the emergent trails for instance… guess Darwinia isn’t fresh enough on people’s minds :)
Generate videos based on final gameplay/graphics to include in the game’s menus.
Tweaks and game play balance as necessary.
Steam achievements. I have steam integration, just have not added achievements yet.
Other Steam stuff like trading cards I suppose…
Tutorial video on how to play. Nothing fancy, just a few minutes of me playing and showing how to move and interact with the game.
Game help menu with description of game objects and items.
Probably 10 more things I’m not thinking about right now."

so it looks like the game is about 90% complete at the moment.

In other news, here is a wishlist entry for Particle Fleet - https://www.gog.com/wishlist/games/particle_fleet - which at the moment has a total of 1 vote!