Apex domains cannot have CNAME records.
Question and response
Question
dig mygames.tools. NS
Answer
mygames.tools. 5 NS ns2.mygames.tools.
mygames.tools. 5 NS ns1.mygames.tools.
Authority
The response has no authority records.
Additional
ns1.mygames.tools. 5 A 45.66.96.0
ns2.mygames.tools. 5 A 192.31.179.179
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0