To add another idea, perhaps suggest him to do first, as a trial, a physical version of it (a board game). Tell him that is a good approach to explore the desig

To add another idea, perhaps suggest him to do first, as a trial, a physical version of it (a board game). Tell him that is a good approach to explore the design space, playability, etc. It adds a different set of constraints, but it is like 10000X more manageable and pretty fun to build together, because the kid can actually do most of the prototype by himself. Quicker to test, iterate, etc. Then maybe he is satisfied with this and will just want to make another different game :)