PYP reception class - Keynote as drawing software

Reception kids like to come the computer lab. Enthusiasm all over. My main problem is the fact that the kids cannot read (or write) yet.
There you go with menus and file names etc. Using Keynote quite a bit with older kids, I was thinking about using some of the nice
elements of the program with my students. They tackled the PYP unit "Home" and I had the kids made a simple house with the shapes
available. Then I introduced colors, fills, and borders. Worked so well! They never knew they were working on a slide.