Wow, 3spoopy5me. I can't deal with this sort of stress. Thankfully the "thing" isn't as creepy as the FNAF type I was expecting. Very cool atmosphere with the anxiousness of having something creep up on you. Well done.
I got 4 batteries before I got got. I think the levels should be smaller or more condensed. I felt like I was wandering around hoping to luck into a battery. When I realized they could be moving, it felt pretty pointless. That may be the point because it's a classic arcade game, but your game isn't a classic arcade game. You can still capture that classic arcade feel without being as dastardly as some of those cabinets are.
Could you share some background on how the thing decides to approach? At first I thought that the light flickers meant that you should look at it to stop it from moving, but it still moved. Then I thought there was a timer between moves based on how long you've not been looking at it, but it still seemed to move with me constantly clicking. I think a bit more clarity in how it moves would make the player feel like they have more strategic decisions to make.
Overall, great entry for a brief jam. Well done! This is a cool thing you've made.