Assault Lite - retro action game

Hi guys,
I would like to see your comments about Assault Lite - free 2D shooting action game in retro style.
More info at Assault Lite

I just downloaded it and installed it. I like the tank graphic at the beginning, and I really like that the settings page opens automatically when the app is started. It would be a lot better if the input keys could be changed. In addition, I am lost as to what the armoured metal plates do and how to collect or use them.

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Thank you Douglas for testing my game. Here is answer:
Armoured metal plates are actually bonus packages for armoured vehicles (increasing energy). You can not collect them as a soldier
You will find armoured vehicle later during mission.