Bug: When I drag an in-training item onto the Use field, then, without confirming, drag another item onto the Sell area, after confirming the sale, I can't confirm the use anymore and the item is lost.
Enjoyable as this game might be, it must be mentioned that the biologists involved are outspoken supporters of "intelligent design", that is, creationism. And it shows in the game:
http://scienceblogs.com/pharyngula/2010/07/cellcraft_a_subversive_little.php
Excerpt: "It is not an educational game, it is a miseducational game." Worth keeping in mind.
 "Utopian Mining"){kind=icon}
 "Monster Arena"){kind=icon}
 "CellCraft"){kind=icon}