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F is speed
You are using arcs, you should turn them off (I & J commands), and it is going to too many decimal places Don’t quote me but I think marlin only handles 2 decimal places maybe 4 I don’t remember its late here. That has your z axis spiraling down .125 each path, using a pen you should not be increasing depth. actually now that I look at it that gcode isn’t complete.
Try estlcam, and the walk through. inkscape is vector based no need to convert anything just save it as a dxf or svg and estlcam will read it natively.