I don't think i'll ever be able to finish the weight gain mode, two different types of spheres is absolute hell (Also, isn't the easy mode harder than the hard mode? Not having the space is not a bonus, especially if the required score stays the same)
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The max sizes are lower on easier difficulties, but you're absolutely right that the container size is too small, that'll be fixed. And maybe other parameters will be manipulated in different difficulties, too. (At the moment it's just growth speed, max size and bottle size). Next update will be balancing difficulties for sure, that's quite overdue.
I'm also considering unique types/shapes of bottles for different levels.