Neat little stealth game! This difficulty is a bit much, with flying robots instakills, especially in the early game, but that's fine. It really gave you that flee mentality and I guess that makes the game more immersive then anything.
A nitpick that searching is a bit slow, and cannot be interrupted, making that a death sentence if you started searching when a flying robot entered from the side of the screen. Not sure if adding interrupt is a good idea though. Also, I somehow got softlocked in the shop where I cannot buy anything or leave the shop menu, my whole progress was gone because of that and I was a bit sad.
But anyway, you did a nice job here!