Did you kid test this? No WAY a 4-year-old can do this – Move the Turtle: Learn to Code Review

The lack of sound means that the player needs to be able to read at about a 2nd-grade level. Some of the controls are not intuitive, like how to reorder the tasks. This has the potential to be really good for 4-6 year olds, but you need to address the lack of sound-based instructions AND more intuitive UI.
Review by MommyLovestoPlay on Move the Turtle: Learn to Code.