Hello!
Thank you so much for such a nice review!
As Robin mentioned, I used Studio One as my DAW. For the VST's I used a whole lot (I think the plug-ins themselves takes up more space than the actual music and sound effects).
The plug-in you specifically asked for is the "Music Box Suite" downloaded from frozenplain.com and has both a free and paid version. I used the free one which had surprisingly high quality and is, as far as I know, not a demo version to get you to buy the paid one.
Thank you once again for playing our game and leaving such a nice review.
-Carl