FYI the license included with this says it's public domain but since you're charging for it not 100% sure if this is intentional. You also mention that you can edit but not sell the asset pack, but that's incompatible with public domain.
Platformer Fantasy SET2
A downloadable asset pack
Pixel Art Assets to easy build own level with all elements what you need.
- 4 Layer parallax Background (two option, day and night)
- Easy Tileset to build your level at 16x16 pixels
- Decorative objects
All sets compatible with each other. You can mix them.
"You can use this asset personally and commercially."
.PNG and .PSD file included.
In order to download this asset pack you must purchase it at or above the minimum price of $3.60 USD. You will get access to the following files: