Fantastic concept and design! We too went for a weapon-of-war-turned-farmer idea for our game too, but our players don't get to actually plant seeds!
I read in the comments below that the clunkiness in controls was intended. I get that from a character standpoint, but think refining the controls and making the robot's farming actions more precise would greatly increase playability. I felt unsatisfied every time my lasers fired, especially when I burnt the stuff that took me several tries to plant to a crisp.
I still think the idea is solid enough that you should continue with it post-jam!