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some parts (especially the last part of the ship) aren't very sight readable this is amplified by the fog and colours that make it hard to tell where the things that kill you are
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the difficulty is unbalanced from the ship with hard and tight movement to a relatively open and seemingly easier cube section
Solving
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Brighten some of the objects like spikes and make the fog in the first section be a bit weaker
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level out the difficulty a little by either nerfing the ship of buffing the cube