Extremely cool concept! Very well done all way round.
My small complaints: The collisions for objects are sometimes goofy since I'm trying to select the object when it's the tile that I actually have to hover over which tripped me up a few times. Also the 2 tile plants seem to be only selectable from 1 tile? Would see this game more playable on a keyboard only than a mouse in my opinion for more precise control
Anyways, I'm just nitpicking. good stuff! also I may be just dumb but I can't figure out the last level? Seems impossible to put the 2 tile plant in the light without blocking my way. Also a cool mechanic would be for the lamp to emit light on it's own (unless it's already doing that)