Thank you for the constructive feedback! I totally agree with adding some story, I had one in mind as I was building it but never got started on how to present it into the game besides my art direction. I really appreciate you mentioning the fact in your experience, I have a bar on them and a sort of “getting detected” pointer on the player that is used for showing detection. I think I needed more clarity with it, and I think sound would help a lot there. I would really like the visual design to be strong enough though, and then sound just really adds to it.
When you mention puzzles, are you thinking of the typical challenge in stealth games with trying to plan how to get through a level with movement and abilities? Or are you thinking of a more defined puzzle that has only one solution, like in a Legend of Zelda dungeon?