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Geometry Dash Lite's maximum level difficulty is Harder. Below is a more extensive breakdown of the difficulty in both the Lite and full versions of the game:
The game divides levels into multiple difficulty categories to give players an indication of how difficult the level may be. The difficulties are:

Easy

Normal

Hard

Harder (Maximum in Lite)

What is available in Geometry Dash Lite?
Geometry Dash Lite's hardest level is rated Harder. The game has a limited amount of levels, and the hardest one is regarded demanding but not as intense as the obstacles found in the full edition.
You also have access to a few basic level construction and modification choices, but the majority of the sophisticated features, such as custom levels and more complex level-building tools, are limited to the Lite version.
What is included in the complete edition of Geometry Dash:

Insane: These levels are one step above Harder difficulty, with much more complicated patterns, fast-moving obstacles, and better precision required to accomplish.
Demon: This is the most tough mode, with some of the most sophisticated and harsh level designs in the entire game. Players must have near-perfect reflexes and timing to succeed at these stages.
The full edition also includes many more levels, additional customization choices, and the ability to build and share custom levels with other players, which the Lite version does not fully support.
Key Differences: Between Geometry Dash Lite and Full Version:
Level selection: Geometry Dash Lite includes a small number of levels with simplified designs and a maximum difficulty of Harder. In contrast, the full version has a considerably wider choice of levels, including ones with more difficulty, such as Insane and Demon.
Customization: The Lite edition offers few options for character skins, color schemes, and level development. The complete edition allows you far more control over creating and sharing your own levels, as well as access to a larger selection of characters and skins.
No Ads (Full edition): Geometry Dash is completely ad-free, however the Lite edition contains occasional advertisements.

Overall, Geometry Dash Lite gives you a taste of the game with a few demanding levels, but the full edition is far deeper and richer, with more difficult challenges, customization, and level development tools.