Hi, I already post to another thread. Actually, there's a tool that very similar to C2/3 that using event system in Unity. Not bolt or playmaker because it have different method, but if you want to work like C2/3 you can use unity asset called Gameflow, it works on components event system. For example, you can use event "if you do..." Then action "do something", or maybe you want to animate Sprite? Just click action "play animation", and many useful actions like "play sound/music", "on click button", "loop", "repeat", and many more. It's also have variable system like C2/3. You just set type of variable and then you can call variable to play with your action.
I successfully convert to Unity using this asset without write any CODE. Totally smooth compare to Construct.
So, visual script on unity that works similar to construct is EXIST.