Tileset, by 
This is really quite good for a MS paint tileset. I’d never use it, but you did very well for having such a limited resource =p
Eyecandy 3/5: There wasn’t a whole lot, but some tilesets don’t necessarily need a whole lot. I would have done the stars in the background a bit differently, but that’s just my preference. The ground tiles were hand drawn quite well, though the spikes are very hard to see against a dark background. I would have made them a different color entirely such as reddish brown to contrast the other colors.
User-friendliness 2/5: The tileset is fairly small, so you won’t get lost looking for specifi tiles. However, there could have been many more types of tiles for events such as poles or sucker tubes.
Originality 0/1: Slimy Land and ET’s Planet are both similar to your tileset, but I still commend you for doing so well with MS paint.