zakiwana guide - bouncing metal slime

this is one of the optional stages, if you can even call it a stage. it's called bouncy because there's a bouncing metal slime blocking your way. he wants you to guess the thing he wants to do right now

as a hint he tells you to check zakuzaku's now deleted nico page where the answer is given, which is: きびだんごが食べたい

the answer means i wanna eat some dumplings, so you decide to give him the dumplings your mom gave you at your house. then the slime goes away and you can exit the stage