The control scheme is "A" to go left, "D" to go right, "W" is essentially up, but only works to enter buildings, which are "up" from the player's perspective, and "S" is to go "down" in a sense, because most of the things you interact with are on the ground, or "down" from the player's perspective.
"Q" and "E" both toggle your tool, which dictates what action is available to "S". Through out my playthrough, I found it frustrating to switch to "hand" tool, simply because the hand interactions didn't feel intuitive. There was a point early in the game where I was confused why I couldn't perform an action and it turned out to be due to having my shovel equipped and not my hand.
Now for my suggestion: Instead of "Hand" being just another tool you need to equip, there should be a dedicated key press for it. I recommend either the spacebar, or "Q". "E" for "equip tool" is a perfect association and is quite common in these kind of games. Spacebar is often used as the action or interact key, so that would be my first choice.
Using this control scheme the game play loop would be more fluid, as the player moves along they can focus on either using the equipped tool, or interacting with items. They can be pulling weeds with "S" and as they pass the recycler they can quickly dump their trash in by pressing Spacebar or "Q" as opposed to stopping to switch their tool.
(I would even take it a step further and suggest maybe collecting tools unlocks new actions, as opposed to switching tools. What I mean is, instead of forcing the player to switch a tool and focus on one type of trash, maybe simply having the shovel, axe, and pick in your inventory is sufficient and then the "S" button can interact with grass, trash, rock, and wood. Whereas, when you start and only have the shovel, you can only interact with trash and grass. In this scenario the "S" key is context sensitive and handles the tool switching for you in the background. I don't feel as strongly about this, but it was a thought.)
