Very nice game, but you should make the vertical speed turn to 0 when the square touch the ground, and more speed please
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Also try making more levels, and if you can do better graphics the game will be awesome, for example, a spiral in the portals, or a circle arrow on the gravity turning thing, this is a good idea for a big project, and if you continue adding new mechanics and more levels with combinations of the mechanics it will be an incredible game, it just need some work and some time