This format may be a bit verbose, but here's a lesson plan I put together. I had similar initial goals of teaching variables, loops, etc. There's not explicit content around those concepts, but I expect it to come up in context of the games that students design.
Unfortunately, I don't have enough reputation to post a URL yet, so you'll have to piece this together:
https COLON SLASH SLASH docs DOT google DOT com /document/d/1HPo-5hfubIDMPU4UKfvx2lgLZLXC-SmztX3-j1J_PtE/edit