Nice package at a fair price.
What missing is the “this asset is designed to save time” value added features.
There are more than a few levels to harvest from but a bit more effort and time put into making a good size component object prefab library, ready to drop and play, would justify a higher price tag.
All is not lost as to value additions as a buff could be added as to upgrade requirements for 4.10. Toss in a tutorial, written or video, as to how to use the paint features and I give it 2 thumbs up…if it matters. 