I'm teaching myself Godot Engine via their tutorials, and it's weird how similar it is to Megazeux. Just like in MZX, you create boards (scenes) and define robots (nodes) which can then send messages to each other (signals). In both pieces of software you define the component bits, and they all interact with each other using what's essentially an observer pattern. This versus game creation systems like STOS or Fuze, where you're writing loops all over the place, checking for collisions and coding interactions by hand.