Sorry for any trouble but on level 4 the player can jump and dash upwards onto the top right platform, and then use basic jumps and dashes to make it to the portal, while avoiding the spikes. Was there a different bug or impossible jump?
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So that’s how it is—the upward dash mechanic is really unintuitive and hardly ever appears anywhere. I’d figured out the level structure, but my theories—that the protagonist jumps higher when fully charged, or that you could climb up using pixel-perfect wall jumps—turned out to be wrong; it’s just an upward dash, hahaha