Good game
+ Fan effect was good
+ Interesting interaction with starry blocks, I got stuck amongst them sometimes, even pushing right through once. I found I got stuck to them on level 6, which was challenging
+Lots to do, building up with more challenges.
-Sound would be so good. Maybe music, with choices and more importantly, an off button for music. A fan sound would be so good and a nice roley plop sound when the 'critters' fall down the holes, or even a long, drawn out ahhhhhh! as if falling down a deep hole. A fanfare or something when you make it to the end of a level and a bad sound when you fail. You could have a rolling sound, like marbles or ball bearings on glass when the balls more.
I got to level five in a few minutes and found it easier than I expected, shooting through first time in a few seconds. THEN!
I stayed on level six for two hours (well about ten minutes!) trying again and again. twice I made a run for it with all four against the evil triangles, having somehow got past the holes, but no... I never made it!
I dont play games much, but Ive never seen one like this. the fan idea is great and I think I will recomend it to Codester, who likes this kind of thing.
Best Wishes,
Ice