Thanks for the report.
The grass tiles line up correctly in Photoshop, so this is most likely an engine sampling issue (atlas padding, bilinear filtering, mipmaps, compression) causing seams. In Unity for example you can fix this by creating an atlas: Create -> 2D -> Sprite Atlas, then add the tiles/sprites there to prevent lines between tiles.
For the ghost “spotted” sheet: the slight off grid framing is intentional, it simulates a small up and down floating motion across frames.
Let me know if this solves the issue.
All the best
~Sauli





