This is a mushroom that explodes and shakes the ground if Mario touches it. Additionally, it can explode and flash after a certain amount of time to warn the player.
Look in the ASM file for configuration options.
Version 1.1 fixes two bugs that caused the sprite to continue to process even when offscreen, as well as when the sprites were locked. The .cfg has also been replaced with a JSON file and the sprite now uses Palette F by default.