I dont know how real plants work but at least here it would be cool if you had deposits, like a tile where you can drop 25+ water or sugar maybe, and if there is a transport tile next to it, the water slowly moves towards the tile, because otherwise the only way i seen to manually put water on transport conveyors is spamming 1 while you move along it. The idea would be to have a place where you drop it all and then it moves on the transport tile.
And sugar is kind of "Light" in the game right now, i really wish they had little tiles to see them, maybe make filter tiles so you can move water and sugar on the same transport but with the filter they're moved to different parts.
The other idea is having a different kind of transport, if sugar is pretty much energy then we need something like "electric cables" to move it around, not really sure but would be nice.
I still think that if you could make this game into a .io game where each players makes they own plant and they all grow up nicely or fight eachother for sunlight or just feeding eachother (The plant world can be pretty brutal) it would make a great game!.