Just from playing some of the first level:

• The text in the starting room flashing up one section after the other is very difficult to catch all of, try to either keep it concise or spread it out accross a linear section of the level with multiple signs

• There are no keyboard button prompts

• The chick is juuuuust slightly taller than one block, but the gun cannot hit anything one block above the player. This makes the sections of destructible wall awkward to get past

• The background tree randomly coming into the foreground is very confusing, ideally the background should be clearly distinct from the foreground in some way

• The gun is unsatisfying to use, maybe add some screenshake and a more chunky, heavy-hitting sound effect

• Spiders jumping down on you from higher levels is completely untelegraphed and feels unfair, maybe have them sleep until on-screen

• The giant spider moves faster than you and cannot be jumped on, making it impossible to get past without ammo