The game has been finished and released here on Newgrounds:
The description I've used:
Major Turdsworth Plumber has the shittest job in the world. Help him destroy the space turds, and when he's sick of it, help him escape his oppressive employers.
Yes that's right, there's an escape level! Tbh that's why this game took so long to create, for a discoverable feature I reckon less than half the players might realise. But I wanted it to be there as a cool discoverable thing, something that might make someone go "...what's this... oh... OH!"
For me this was just a project to learn new stuff, and I'd planned only to release it on the Unity web player. But annoyingly, Chrome has pulled the plugin in the time it's taken me to create it! So I recommend using Firefox to play it.
If you want an executable version for Firefox and Windows, let me know and if I get enough interest I'll create one.