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The echo mechanics seems to be only a way to discourage movement. It's far easier to just sit there shooting at missiles.

Yeah I realised in my final stages of testing, and I ran out of time, If I ever come back to this then I'll probably think of something to encourage you move (maybe some random teleportation if you sit still too long or something), but you're absolutely right, but such is life when this is your first "proper" game ever