Neat game, especially like the time-based aspect of it so you have to time where you are!
Current level is pretty easy to cheese by just walking onto the finish tile, maybe some tiles which the guard can't access could help?
Also feel like it might be better to remove the 'planning' aspect and just make it turn-based, with the guard and prisoners moving one tile at a time, I think that could speed up the trial-and-error process in the game as well as simplifying the controls! (Although, that might mess things up if you were planning on adding multiple guards)
Regardless, a very neat puzzle game!