(I am now in a rush to test as many games as possible to help, so please do not mind the cursory reviewing style.)
game jam page: you answered the cookie question by copy-pasting the question, you may want to fix this. ;)
I like the 3D lighting effect coming from the player!
there is a big problem for diagonal movement
not easy to know which key opens which door; it is on purpose, for higher difficulty? Otherwise, some indicator would help.
Freeing the prisoners reminds me of "Alien 3" on the Super Nintendo. X)
apparently one checkpoint where we respawn after failure
the vision cone of the guards go through the walls and can intercept us; possible enhancement: block vision by the walls
I won right after freeing the last prisoner; I relaunched the game to see what was located at the right end: apparently, you should have to go through one last door (the one with the condition as a sentence), so I think winning right after freeing all prisoners is a (moderate) bug.
Hey, it was a good moment! :) Apart from the diagonal controls (I played without them!) and the lack of other checkpoints, I had fun navigating the prison. Apparently, all guards’ patterns are predetermined, but you could throw in some randomness for some guards. I liked how you put some keys ON moving guards! As for the constraint, you used it more as a theme (ie the prison and prisoners) than as a distinct mechanic (since, after all, the prisoners could well be mere objects we have to collect) or anything really special. I still think your concept has some originality!
Thanks for the game. :)
(By the way, just putting here that my game is pending until I get the submission form.)