Li'l Eraser Cat has lower stats than Crazed Tank Cat and Manic Eraser Cat, with the similar attack style of slamming itself to the ground. Unlike those two, however, you are only able to use Special and Rare cats while fighting him. A notable difference that separates himself from his Crazed and Manic counterparts is that he loses his Base Destroyer ability, but has a faster attack rate in exchange.
Turn the animation on and off using the switch in the upper left. Clicking the viewer background enables scrolling and zooming with the mouse if on desktop. Note that browser zoom may cause issues with scrolling and zooming. A list of available backgrounds can be found here. For more info on usage, see here.