(GMed at high tier)
This is literally the best SFS scenario i have seen until now. The combats where challenging and interesting. There are not 1 but 2 different stories happening and both contain some twists to keep the players engaged. This is especially impressive considering that this a transitional scenario as far as the metaplot is concerned. I was contacted by players afterwards just to tell me how much they enjoyed it! I also need to praise the artist of the Izalguun, it is great when players meet an alien species for the first time and the first thing i hear is "this looks cool, i want to play that".
On a personal note i also like that it sets hooks for multiple sequels besides the main metaplot.
I have a few minor nitpicks from the GM's side. There are many bonuses to certain skill checks that are determined by stuff happening earlier and it was quite hard to keep track of everything. Some sort of handout where you could mark everything would have helped a lot. Also the sandbox part felt sort of bare, i was forced to add a lot of flavor.
All together this means 4 1/2 stars which in this case i can round to 5 stars.
Great work, i hope this sets the standard for future scenarios.