Pretty nice stealth game! was fun to try to sneak my way to the other side. One thing though is it was very hard to predict the patterns the enemies were going to do. Having a little indicator showing where they're going to go or making the pattern a bit more predictable would make it feel nicer and make it seem like you're beating the AI rather than just being lucky.
As soon as an enemy spots you you're dead as well which doesn't really feel the greatest. Having some sort of way the player can save themselves tends to work really well in stealth games to allow them a way to fix their mistake if they're good at the game rather than need to give up instantly.
The sounds tended to be instant death due to how quickly the enemies moved to see what it was. having a little bit of confusion time where the enemies don't move before they begin chasing would allow the player to use it more effectively