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Venus has a gibbous phase at present so it will look oval.
To test your optics and your eyesight properly, select a star. Rack in and out slowly. Is there any oval shape to the out of focus image? Does it change 90 deg the other side of focus? This could be mirror astigmatism. Does it rotate with you as you turn your head 90 deg? This could be eyesight astigmatism.
As for the spikes try increasing the power. Are they still there? The lower power will produce a larger exit pupil which passes through more of the edge of your eye so if you have any defects there they will show. At higher powers you have a smaller exit pupil passing through less of the outer region of your eye. When you look at the stars in the sky unaided, do they have spikes?
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