Thanks for the kind words! In regards to the theme, it was extremely unclear previously due to the lack of visuals during cut scenes. The sacrifice theme is set up when a level is completed. You will get a choice whether you want to free one of your colleagues or not and the more you free, the harder levels get due to the fact that you will be missing certain skills. The choices you make also determine which ending you'll get. Now with some placeholder cut scenes, the theme should now be a little clearer.