Well it maybe is technically correct to call many games with level-up progression incremental, but it is not what the term means.
In essence it means cookie clicker-likes or games more akin to that experience. They're "incremental" because in all of them the main end goal is to make some number bigger in an incremental (comically repeated action, ie "clicking cookie" or "producing paper clips" etc) way.
Besides: the level-up progression is just a mechanic that enables you to scale your power. The main objective (or mechanic) in other games is usually story, combat or puzzles. The main objective of incremental games is make the number bigger - everything else comes after that.