Welcome to Geckos Unlimited, Spleekly! Is your little guy captive-bred?
A healthy crested gecko should stick exceptionally well to many surfaces. He or she should comfortably climb glass, painted walls, & varnished wood. This gecko should be eating & pooping regularly. His sheds should be complete!
Keep his environment between 70-80*F. Those will be good lifelong temperatures. Mist the enclosure thoroughly at night. Let the enclosure dry out during the days.
My 17 yo crestie George eats Pangea powdered diets: Pangea with Insects Complete, Watermelon Complete, and lately Fig with Insects Complete. I've had George 15.5 years. Long ago he became disinterested in crickets -- perhaps because I did not alternate them with his powdered diet on a regular basis.
It's important for a crested gecko to get Zoo Med's Repti Calcium with vitamin D3 lightly dusted on most crickets @ one feeding per week OR a well-recommended Complete Dry Diet 3x per week. Zoo Med's Repti Calcium with vitamin D3 contains an ideal level of vitamin D3.