Btw for anyone reading this (me late) heres a tip for all transformation paths
Perfect line (celestial, cosmic tree)
Only eat apple seeds. First try to eat a good food like lemon clam to give you more hunger to start, then insert ONLY ¥50 yen for 50 apple seeds, this worked for me. 5 stages
Unhealthy line (gluttonous sugar addict blob)
Only drink sodas, but you can also eat better foods like chocolate food. For sodas, only insert ¥150 which will always guarantee a cola, pepsi or ghostbusters soda. 5 stages
Anomalous line (Rainbow alien)
Only eat foods such as fluffy alien box, lemon clams, rainbow apples, that fetus in a bottle, bottles eyes, sewage and i cant name more. Inserting ¥100 will have a 11% chance to give you an anomalous item. Inserting ¥500 yen has a %50 chance to give you an Anomalous item.
Parasite line (Queen of insects)
Eat foods such as bottled worms, cicadas, pile o slugs, roaches (ROASTED ROACHES ON A STICK DO NOT COUNT), and more. Insert ¥100 for the best chances but im not sure.
Liquid line (Hollow bride)
Unobtainable, no liquids will do anything, sodas will lead you to the unhealthy route, sewage water will lead you to the Anomalous route, antarctic water and figi i dont know