You are controlling the blue player. Press WASD, arrow keys or swipe (For mobile) to move. You can push one box at a time. Push it into the blue bin. Sometimes, you make mistakes (Like if the player falls down) that can't be undoned, so click the restart button to restart the current level. Invisible blocks will exist starting in level 5 and can be revealed when the player or a box is on it.
(3D-ish) I made the game up... In progress; more levels coming soon Credit Scratch and @griffpatch ‘s paper Minecraft