This is an old favourite. In my opinion, still the best way of introducing algorithms to KS1. It’s a great app and the physical Bee-bots compliment it very well.
I tend to begin by teaching instructional language in games such as ‘Simon Says’ to EYFS, then moving on to Bee-bots themselves, before consolidating skills on the app. It’s a crucial age for securing the correct terminology and Bee-Bot gives you the opportunity to do that.
Above all, the app is great fun, which is essential for younger children. Once children are comfortable with the interface and have grasped the basic concepts, children will choose to go on the app unprompted and learning to create algorithms in the process.