Alright, now I'm not a stealth game designer (I mean I struggled with AI for my game 2 weeks ago), but I've got some feedback.
1. The second and third abilities, the panic and the stun are both way too useful compered to the rest of the kit, I mean instant disengage options in a stealth game are usually very hard to design around, take the dishonored series for instance they blink is a constant element of the kit and if you ever tried to beat the games without it you might find that they are much more difficult for it.
2. The binary detection is kinda a pain in the ass, when it comes to detection systems it will usually boil down to two aproaches, either analogue where the enemies have awarness and they will transition through different states, from suspicious through alert to combat, some of the games using it would be metal gear solid or the dishonored series, now binary systems are trickier to design and usually would feature a lot more information to the player like vision cones or noise visualisation. If you make a binary system and don't give the player any information on how close they can get and when they will be noticed it makes it pretty unfun to stealth since you're pretty much stumbling in the dark.
3. The targeting. One thing that was a objective problem is the camera position and also the selection cursor, the camera since it's tilted was really unfair when walking down the screen and the cursor also had problems with selecting enemies do to the iffy selection especially when trying to select someone that is hugging the bottom wall of the room.
4. Lastly the stairs. Now this really isn't a critisism cause everyone has some bugs but I just couldn't resist not talking about the lack of colider of the celing and walls on the top of the stairs which allows to just climb on the wall and walk on them towards the exit. (I found it on the left stairs of the first room up from the starting cells)
And now I know I just droped a lot of criticism, but I still enjoyed it, even with all it's quirks and problems there still were parts of it to enjoy. (And I won't list them because time constraints)