How I can store an instance of an object in a variable, so I can assign, replace it on the fly and get instance object properties (coordinates...) directly in the Event sheet ?
Develop games in your browser. Powerful, performant & highly capable.
You can use those variables to store its information however.
But I want also to modify the instance in question coordinates on the fly. Can it be possible ?
I was programming in C#, with Unity, gameobject variable is very useful.
Yes, most anything 2d can be done.
It may not work the way you expect it to though.
You should check out tutorials in picking and instances.
The how to section is also helpful.