Wow, cool game) One suggestion. I really lacked some SFX. Music is moderate and fits well, so it covers for lack of SFX. But for future, you can always use next resources to get free music/sounds https://pixabay.com/ https://www.beepbox.co https://freesound.org/
Great choice of granting superpowers at the end. Was fun to roam around. The game crushed, though, when I pressed E on a bomb)
My game is also about zone51 :D