This game could be good, but you should tone the amount of enemies down (and change some sound effects and assets) to better fit the feel of Level 0 of the Backrooms.
Edit: feels more like Level 0 now (I can't talk about entities tho, because I haven't read up on Level 0 recently), the only thing keeping me from giving this game 5-stars is the obnoxious godzilla screech in the background. Other then that it's pretty good!

None of the creatures are even from the Backrooms. Also, there's too many enemies. Actually, there are creatures from Level 0. Examples include Entity 59. http://backrooms-wiki.wikidot.com/entity-59 You should also include Entity 467 http://backrooms-wiki.wikidot.com/entity-467 because it lives in all levels of the Backrooms and brings people who break down the walls in Level 0 to "the jail". Also, I think that the goal should be trying to get out of Level 0 into Level 1 rather than collecting apples. Make sure to add http://backrooms-wiki.wikidot.com/entity-19 I'm counting on you to make a faithful Backrooms game! http://backrooms-wiki.wikidot.com/object-24 Object 24 should be there too. Make sure to put all the creatures and objects that I have mentioned into Level 0. Level 1 shouldn't be the end. Also, if the Splat is invisible, it would be pretty unfair. Also, make sure to upgrade the game's rating from T to M. Also, where are the creatures? http://backrooms-wiki.wikidot.com/object-25 Object 25 is also found in Level 0. http://backrooms-wiki.wikidot.com/object-6 Also put this in Level 0.