The gameplay is fun. I also like that after being spotted, there was an option to run away if possible. Fun to see a small story in this. Not a lot of game jam games have a "story". The small extra things in the game were a nice addition: character customization, screen transitions, zoomed out map and all that. It makes the game feel more "finished" even though gameplay wise it only had a few mechanics.
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Because I used unity I used something called an Overlap Circle to detect the player. Then used sin cos to make the "vision cone". When the player is inside the vision cone I simply called an raycast to see if anything was obstructing the guard's view.