Yes, there are certainly quite a few exeptions, some doing a mix like downwell: predefined enemy/block types progressing stage to stage and random level arangem

Yes, there are certainly quite a few exeptions, some doing a mix like downwell: predefined enemy/block types progressing stage to stage and random level arangement. I just wanted to make my point that it doesn't need to have progressing levels for the basic thrill. I really like clever human-designed levels though :) Much more surprising and less optimization, more quick grasping and adaption required.