45 degree needs no aaing, rotates fine, also
![](http://pixel-arts.org/junk/yi/6.png)
I have a problem with this tileset, my brain would interpret it as 'spikes, don't land there'.
also, the constant use of black hurts depth to the point where I'd consider these blades of grass on this one
![](http://pixel-arts.org/junk/yi/5.png)
also to be a gameplay hazard and I'd try to not fall on them.
Yoshi's Island looks very flatplane to me because of the art style, most of the time.