UnityStandardAssets | Unity Standard Assets used in SanAndreasUnity project | Game Engine library

Instead of using Destroy(Corazones[0].gameObject) you could use Corazones[0].gameObject.setActive(false) or simply Corazones[0].setActive(false) since the array already contains GameObjects.

This would preserve the GameObject while all of its components and children would be inactivated including its Renderer which would make it disappear.

Then later when you need it you could reactivate it using Corazones[0].setActive(true).

When you add using UnityEngine.UI; you are telling the script about a namespace you are going to use so you don't need to worry about using UI.Text, just use Text.

You also have a variable m_UIText, but when you try to assign it in the Start function you refer to it as m_UI.Text.

Simply replace the line with m_UIText = GetComponent();

The comment of Redired Ninja is right, you cannot use . in a variable name. But you can use _.

Here is the basic rule for variable naming from Microsoft :

The first character of a variable name must be either a letter, an underscore character (_), or the at symbol (@).

Subsequent characters may be letters, underscore characters, or numbers.

There are also certain keywords that have a specialized meaning to the C# compiler

There is also another thing that could produce an error in your code:

Starting at the line [RequireComponent(typeof (UI.text))], you are using UI.text with text in lowercase. If it is not the UnityEngine.UI that’s at use here, it is fine.
But if it’s what you are trying to use, the correct syntax would be UI.Text, with a uppercase T.

Letter case matters in types and variables names.

Also, if you want to avoid using UI.Text each time, you could also add the line using UnityEngine.Text; under the first using statement, at the top of your file. Then, you could rewrite [RequireComponent(typeof (UI.text))] as [RequireComponent(typeof (Text))].

Edit: It seem that kolodi commented on UI.Text part of my answer while I was writting it.

You could try adding the transitionERR.SetTrigger("start"); before using the StartCoroutine(LoadLevel(1));

You could make an event for the animation end and then put your load scene code in there. Something like:

I think CrossPlatformInput is under 'UnitySampleAssets' and not under 'UnityStandardAssets'" So you need to add an assembly reference:

The issue is that your current health variable is static, that means that each enemy is using the same variable for health.

Static makes the varaible global to everybody.

remove the static modifier and the variable becomes personal to each enemy ;)

It's define in Component class , and monobehavior inherit it. and you using UnityEngine; so you can found it.

It's very straight forward, this should be the easiest way.

1) create a button in Canvas UI

2) create a public "Jump()" function in your "Move2D" class

3) assign this public "Jump()" function on your button event in Canvas UI