Was it just me or the ship accelerated a little or it flew with constant speed?
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It was built this way as too much initial speed means the player won't beable to see it happen as well and scaling speed would be a little difficult. Too much gravity would need lots of speed to make a slingshot. And Velocity is constant in space. So you have to be decently close to the planets in order to be affected to a decent manner. I can assure you though that the gravity is working as intended as shown when you launch the game there were 3 squares with gravity with spaceship pictures attached to them.