In this Issue, I will keep a list of features that are present on the Webseite, but not yet in this utility.
The best resource is the shadertoy changelog.

• Common renderpass (append to the compatibility code) Add basic common support #19
• Buffer renderpass (render to texture) Add multipass pass support (buffers A-D) #43
• Audio shaders, Audio input (sound file, soundcloud?, microphone Add microphone/audio device input #53 )
• keyboard input [WIP] add Keyboard input #54
• pause/suspend and restart key binds (alt+down arrow, alt+leftarrow)
• video input, webcam input?
• mipmap sampling for textures
• Vflip for channels (maybe introduce numpy as a runtime dependency) Add vflip for textures #26
• Cubemap Textures
• Volume/3D textures
• Cube renderpass
• missing uniforms:
  • iChannelResolution Add iChannelResolution uniform #18
  • iChannelTime (needed for video/audio?)
  • iSampleRate (needed for audio)
• VR support?

this isn't an exhaustive list yet and the top comment will be updated
The goal is to support most of the functionality offered on the webseite.