Great work on the noise system! I really like the idea. I'm a sucker for stealth and I love how risky it use to use the gun. But I found the game very difficult - I couldn't beat any of the levels. Maybe you can expand on the idea in the future with more interesting level designs. The levels are really big and empty right now, so it's not very exciting to explore them.
Thanks for playing! Yea I spent too much time on system implementations and left only some hours for level design and playtesting, my initial plan is to (maybe procedually generate) some indoor rooms with corridor and open grounds, and gradually introduce battery charging in first level, using grenade to draw enemies' attentions at second level... Currently I guess I will tweak the existing levels and maybe add some levels between Tutorial and Resident, glad you like the noise system! :)