All collections require approval from the Pixels team. Any collection that promotes hate or is deemed inappropriate will not be integrated.
Although we do not have specific requirements for size, we suggest 48 x 64px. If the artwork is much larger, it will be scaled down, which may affect its quality.
For animated traits, we suggest designing within an 18 x 9px collision box.
Make sure that the sprite is centred along the x-axis within the frame. This is important for movement.
Each trait must have the same number of frames, across the entire collection.