I'm surprised by how fun the gameplay loop was. The dungeon design in both first-person and third-person views reminded me of old 8-bit dungeon crawlers. It was really authentic feeling. There was a lot of motivation to switch between views with the battery draining feature, as well. A unique stealth system that would definitely be worthy of cutscenes gluing levels together.
My two cents for improvements. Make the alert sound less frequent or less high-pitched. Make the third-person view drain the battery slower. Separate things into levels with cutscenes, perhaps?