This is an incredibly underrated game! I like the concept and execution.
There is currently a bug, where sometimes the walls don't spawn in, and the map is just an empty box. I'm not actually sure if this is intended.
The gameplay is functional, however it could do a bit better with some extra features(like more powerups). The core gameplay is there and it's solid. however adding more variety would be awesome.
A nitpick I have is that the pink cookie power-up is way too overpowered, it's really easy to shred 2 of the 3 ghosts and start farming cookies with just one power-up use. Maybe the ghost pathfinding needs an improvement, however making the ghosts respawn after a short while could be a simple yet effective solution.
The visuals are really good, I like how the walls look somewhat 2.5d, which is really hard for an amateur like me to draw. The simple yet consistent art style is great for a game of this scope. Music in this game is also quite nice, I really liked the 8-bit music style.
The leaderboard really boosts the game a lot in my opinion, it gives the player something to work towards. I might think of implementing it in my own games.
Great game! Like I said, this is very underrated, deserves more ratings.