It was a bit arduous but we got there in the end.
I appreciate the motivation to teach children about recycling. It would be helpful if the information on which bin is for which item was present during the levels rather than only available on the main menu. There are also some items which are indistinct, for example a 'ketchup bottle' in this game is assumed to always be plastic, but isn't labelled as such.
It would be a nice quality of life upgrade for the recycling bins to be in the center of the level so no trips feel especially long. The tank controls are also probably not ideal for the target audience of younger players. Though I suppose it does accurately depict that picking up trash is a bit of a chore. :)
Having different types of trees to plant is nice for variety, however it's a bit odd when the Main Tree disappears once its saplings are depleted. While I understand it's to make the player use an equal amount of each type, it gives an impression that the original trees have been sacrificed.
The music sounds nice... for a while. It does take some time to complete the later levels and the repetitiveness gets quite noticeable after a few minutes. Sound effects for correct or incorrect garbage placement would be nice, to make correct choices feel more rewarding and incorrect ones to be called attention to.
Since the player is teleported when straying toward the edge of the world, it would be nice if the outside area was visually fenced off rather than revealing the skybox.