Congratulations on making your game! I really like the look of this and I think it is presented very well. 

I'm with Darkgecko on the controls, using the mouse to rotate the character doesn't feel very intuitive and made it harder to control the character than it really should be, to the point where I gave up rather than struggling to make it through the level. 

I think you've got a solid base here and I'd love to try again if you do change the controls!

I'll get this out of the way, the controls were infuriating.  It would feel more intuitive to use the keyboard for all directions since there was no mouse cursor to indicate my rotation value.

That aside, it was compelling gameplay.  Consistent look and a fun execution of concept.  This definitely seems like something worth pursuing.  I happen to like stealth games in general so it scratches a particular itch there.