Like others have said, it's so impressive that you made the game engine and got it working on web! If you come back to it, I'd be interested in what aspects you could change to make it less similar to Hotline Miami - what experience do you want the player to have etc?
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Thank you! The web port alone took two full days (and still had issues after submission :D).
My original plan was multiple buildings with multiple floors. The main targets would be on the first floor and exploring upper floors would give you new weapons, grenades and upgrades. But dying upstairs would wipe your inventory.
The web port, physics and enemy behavior took more time than I planned. But if I decide to continue, most of the systems are ready for more content.