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This is early version, current version supports animation displacement which randomize enemy animation start frame.
That in itself makes each enemy move independently in it pre-programmed pattern. I can add additional patterns as behaviours tho. And current version supports that and freezing frames. It is not only a set of frames that are animated but also screen movement. This is demonstrated in this old video by moving the ball bouncer to a new location of the screen. Yeah it is complexed