Veeeeeeeeery flat level design with long empty sections with no enemies and gimmicks whatsoever. Protip: this isn't fun at all. Also, the way you made the player not proceed to imply it's a demo was really awkward: placing a wall in the level and a message saying you can't go any further is really unprofessional, as the player can't even beat the level and get an exit. It'd be best if you allowed to do it and then blocked the entrance to the next level in the OW.
Speaking of the OW: it's flat, squarey, has cutoff, and has nothing interesting to offer either.
Graphics are vanilla, but the backgrounds and paletting were kinda... cringeworthy, as there were mostly unfitting colors and BG's were repetitive/empty.
Overall a hack that practically has no effort or professionalism put into it, making it look more like a test level than anything. It was a waste of time in my honest opinion.