@aki thanks for trying bud! Sorry for the lateness of the reply, I’ve been super busy getting 5.1.0 out the door (which solves a few issues related to assets in css/scss files). Getting onto 5.1.0 is the next step for you.
One thing I’ve bumped into (even in 5.1.0) is that the ~@images alias doesn’t seem to play nicely with @roots/bud-sass. I don’t know yet whether that is solvable on our end or an incompatibility with upstream dependencies like sass-loader and postcss-scss. For now you’ll need to use relative paths like url('../../images/my-image.png')