my 2 cents

1) there is a little bug: if you delete the sprintes named "one" from the folder, you get an application error due to the hardcoded call to "sprite-size(one). I removed it and add the half size genertion for all the available sprites.

2) In every project I need a special font family, a font that cuold be different from h1, h2 ecc. Menu labels or other stuff. So a special font could be welcome!

3) to manage zindex could be a mess. If we use variables for zindex values, we can see in one single place the level of each element and easely change it