Hi I'm on steam and my GMD don't work :/ crash report : Unhandled exception at 0x61C32C32 (libcocos2d.dll) in GeometryDash.exe: 0xC0000005: Access Violation while reading location 0x0000022C.
Some people in the GD Steam community discussion appear to be having this issue as well. I think what's happening is that your graphics card (specifically your NVIDIA graphics card) isn't updated to the newest drivers. The most recently (and widely) accepted fix is to update your driver to the newest version, which can be found here. If that doesn't work, please post a reply to this thread with the updated error report, so I can get a better look.
In the future, go though the basic process of game debugging before posting on the forums. These are some recommendations:
Right-click on GD in your Steam library, click the "properties" option, then local files, and then click on "verify integrity of game cache"
Delete the game from your hard drive and reinstall it.
Make sure that you don't have a modified or corrupted save (CCGameManager.dat or CCLocalLevels.dat)
Try running the game's .exe as an administrator (right click on the application, click "run as administrator")
Search YouTube for people with the same issue, and see if and how they solved it.
PS: this list of steps works for pretty much any Steam application with startup issues, with certain game-specific changes.