Thanks so much for playing!
For the UI placement of plants do you mean, how it gets placed when you first buy it? Or clicking and dragging to move? I was thinking of adding a toggle option for disabling plant movement (might help later in the game when you have lots of plants on screen and don't want to accidentally click and move them).
General UI - are you playing on phone, tablet, or desktop? I would love to improve it to make it better for all.