Critique? Okay. I'll start out by saying that it's a good tileset. Not one of those slap-together-in-two-minutes ones. The first thing I notice is that there's a window tile with cracks in it. Not that this looks bad, but if you have multiple windows it starts to look repetitive. Perhaps a duplicate window without cracks and possibly another with different cracks? The same is true of the center ground tile. Next, are the Knytts: their hair color, grey, is a bit unnatural, and blends with the skin. If that is not hair, and is instead a suit or something, I'd make the distinction a bit more obvious. Furthermore, the other Knytts are a bit round. The trask can is good. When placed on a ground tile, however, the dirt and the dirt on the ground will be cut through by a black line (the border of the ground). I'm not sure how to fix this. The grey rips look okay on the dark brown couch, but they stand out a bit too much on the red one. Perhaps a reddish tint would fix that. As for the glass. In general glass came be made semi-transparent with alpha-channel. If you don't know how to do this, however, don't bother. The color of the glass is not quite right. It is a bit too dark. As it appears to be a rather broken down kind of tileset, I would advise making it a bit more greyish. Or at least not as bright blue as you have it at present. The signs look too mspainty for my tastes. One thing you could do is put some amount of effort into making the words look more real.
Wow that's one of the lengthiest comments I've made.