I liked the sfx. the player's footsteps were unnaturaly slow, but at least you couldn't mistake them for the enemies. The lighting was really cool and it added to the atmosphere. Not sure about mixing art styles. You got some assets that are pixel art (the diamond), pixelated characters and even vector art (the alarms) so that kinda threw of the asthetic, but I guess that it's sometimes hard to find visuals with matching style.
Honestly not sure how the loop aspect affects the gameplay. After basically three/four loops I didn't have a need for other tools and they just cluttered up the space. And even after these loops the game didn't feel any different. Maybe each time something else could change in the level?