So I figured it mostly out, going to leave explanations for what I believe the mechanics to be
1: Seeds always pop up under 100 yen or occasionally higher, it is NOT worth it to go for seeds except in amounts of 1, 50, or 1000. Any other amount and you will usually get less than what it's worth.
2: The game functions in transformation lines, with your base form being one of them. You CANNOT transform if you have progressed any amount on the "hungry" line.
3: Progression on any transformation line, including the hunger one, will regress whatever line you are currently on.
4: The machine is not going to give you rarer things if you dump a ton in, instead it is like a code system. So far I have determined that 150 will always give a cola, and 50 will always give you 50 seeds
5: Each line appears to have 5 transformations
6: Foods appear to be organized into groups of items. I suspect these groups are bug, flesh, sweets, soda, and seeds.
7: The hunger transformation will only regress the other lines one stage at a time, so you can progress a bunch along the seed line and use the time to accumulate items for the others
8: The goal is to collect food, not money
If anyone disproves one of these please let me know?