Installation:

A. Install with the Crustacean Installer

B. Manual installation instructions below:

• Download Bepinex.
• Open your game folder (In steam, right click crab game, Manage > Browse local files).
• extract Bepinex so that all of it's files are in the game folder.
• run the game once. This will take some time.
• close the game.
• download MoonwalkIndicator.dll from Releases.
• move MoonwalkIndicator.dll to (Game Folder from step 2)/BepInEx/plugins/MoonwalkIndicator.dll.

Features

• Damage flash when dropping a moonwalk (going from 20 speed to less than 20 speed while in a state where it would have been possible to moonwalk to keep speed)
• Velocity direction indicator next to crosshair. If you're not sure what this is used for, try moonwalking and watch the blue dot, notice how you keep it away from the crosshair/center of the screen.

What is moonwalking?

See this video or this one for a more technical explanation.