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Come to think of it, playing with the shrykull would be challenging as well if you want to rescue all the mudokons without blowing them up 
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I'd be interested in a challenge where the shrykull and possession powers would essentially be reversed; eg you can use the shrykull for 99% of the game, but you'd acquire possession in every stage that would otherwise have the shrykull in it. Possession would be acquired at the beginning of the area and would not wear off until the next checkpoint, requiring you to strategically use possessed enemies to get rid of the explosives, etc. that were in levels with the shrykull power as far as I remember.
Of course, it would most likely not make a suitable game mechanic, but still, an interesting challenge. :P