Playability:
Easy to understand direction for gameplay and a good evolution of mechanics as you go through levels. You've done a great job with a small amount of systems here.
Theme:
Fits the theme as a stealth puzzler but would like to see more in terms of narrative.
Cleverness:
Simple mechanics like this often lead to very interesting games further down the road. Keep cooking.
Artistic Style:
Nice and consistent pixel art. Nothing wrong here at all.