Quickly test the game with these 3 open access levels:
Gunner's fight
Here's a 2-on-2 fight with the exact same weapons. But since this is a test, your robots have more health. Use this opportunity to get used to long-range shots.
In this fight, your robot is alone against 4 other snipers. But it has the advantage of being able to fire twice per turn, and its terrain allows it to take cover. Enemies only fire once and are exposed on fragile terrain.
Here, your robot only has the first level of movement, but it has the advantage of being at a height. Take advantage of this to drop grenades on your enemies while staying out of range of their fire.