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You're going to get plenty of disparaging comments because this is on the same portal site as many professionally-built games. This game is simple, and does what it's supposed to do quite well. A decent first publish.
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You get a high score for this being one of your first games, but here's what I see wrong in the game: You implemented gravity switch just because it was cool. There's no purpose behind it, it feels just snapped on randomly to the game. Why is door 3 behind door 4? A bit repetitive. Good thing that you introduce abilities progressively (Robot Wants ___ taught you well), but it still feels like you are doing the same thing. There's no real feedback for the player, no sense of accomplishment on anything. Try to make a few different enemies, think of a 1 line background story for each (you don't have to include it in the game, but it might make them feel real and you might see some important traits they have) and if you want a classic boss, try to vary him a bit, make him go through a few more states for example.
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Not too bad, but also a little bit close to the "Robot Wants ___" series. It was decent, unlike most of the new games that get posted (90% of them are virtually unplayable).
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This "Metroidvania" game might be very good, keep up the good work !
(Also i'm glad there's no robot or kitty inside :) )
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Quick, easy, relatively enjoyable but quite forgettable. A good effort if it's your first attempt. With a tiny bit of improvement it would be a much better game.