Ofc Backloggd userbase would be negative on this, but I think it's fairly a nice game: an alternance of fully explorable open-map levels with side-scrolling ones. It's tough alright but it's definitely fun.

All you have to do in the open-map levels is to destroy the main bases you see. For the barriers check the ones that can be open by shooting those switches. The game makes you understand which one, it's not hard to understand it. If I can manage it 1st try, you definitely can.