A good entry, if a little short. What you had in there was well done though, the controls were good and the line of sight / vision mechanic was well made. The sprites were good too, I liked the look.
I think the AI was ok considering this is a game jam entry but yeah, it wasn't too smart. I'd also recommend spending some more time on a few more levels and some sort of win condition next time. I wasn't sure what to do once I killed all the enemies, adding something to say you've won makes the game a lot more satisfying to play.
Otherwise, great work. =)