-it only works well with a mouse

-you can't change the size of the canvas without resizing the content as well

-you can't move/resize a shape once you've let go of it

-you can't move/resize ANYTHING once you've let go of it

-you cannot simply place ONE PIXEL'S worth of color in a picture no matter how many times you click in brush mode (this HAS to be done with the Fill Bucket)

but otherwise, i'd say that i really do like this program

...though I'm honestly REALLY ashamed that I use bases in Paint...