Simple
It's not a bad piece. It's fairly simple, and still a little interesting. Pixel art can be pretty tough, so I won't be too harsh on it.
Firstly, I'm glad you made an effort to shade it, instead of leaving it in simple blocky colors as many would do. I also like the way the rabbit looks, too, strange as it is.
It has some noteworthy flaws, though. Shading has to be consistent with a light source, and in this case would usually be located on the underside of the rabbit, because the sun would be shining on the back of the rabbit. For some odd reason, however, most of the shading is on the rabbit's back, instead. You may want to do some work practicing with shades, best done with a pencil to get the concepts developed mentally. The heart looks somewhat lopsided, as well, and I feel you could have done a better job integrating the flood icon into the image, perhaps by moving it up and drawing a heart around it instead of above it. Yes, I know that it's considered okay to dump it in the corner, but in a smaller piece like this, it takes up a considerably larger portion of the image and is much more noticeable.
Keep practicing and you'll get better with pixel art. It would be great if you could find a way to show the forum some non-mouse-drawn work, as well. Hope this helps in some way.