In Pegasus you play as a secret agent. The game starts off dramatically, and after that it mostly consists of a series of flashbacks that explain how you ended up in the situation that opens the game. At the very end there's an important choice to be made.
The writing is strong, and the pacing mostly keeps the game moving quickly. I found myself invested in what happens with the PC and his partner Sarah, and I wanted to see how things ended. There are puzzles, but this is a story-focused game, with lots of conversation.
The game also explores Sarah's background and how she ended up as an agent for the Pegasus organization.
I had some trouble with some of the puzzles (especially the first two). The puzzles themselves weren't hard, but I thought they could have been better clued - in the sense that I tried some things that were similar to the correct solutions, but the game's response didn't indicate to me that I was close. There were also more spelling and punctuation errors than I expected given the quality of the writing. I think having a few more testers on the game would have helped with both of these issues.
Story-wise, I think fleshing out a few more things would improve the game, such as more on the background of the PC's partner Sarah. (This is mostly just hinted at, albeit intriguingly.) Also, there were two choices near the end, (Spoiler - click to show)how you respond to the phone call in the office building as well as the major choice at the very end, where the working out of the consequences of these choices could have taken the story in even more interesting directions.
Notwithstanding these criticisms, I enjoyed playing Pegasus. It's a short, tight, well-written thriller.