Definitely has potential. Doesn't seem to be a way to exit the game though. It's also really easy with all the clues given ahead of time and the ability to reshuffle your inventory pretty much whenever. Also not sure exactly what the point of it being in 3D is.
As it is I also wouldn't really call it a stealth game. But if you made it so you can't so easily rearrange your inventory (like being in line of sight of guards for example, and maybe have them AI'd to follow after you if you try hiding around a corner in certain zones), it'd fit much better.