Ignore Them
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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Everything you need to know is in-game except the HUD... The red bar on the left is your health, the blue bar on the right is your ammunition, the green bar on the top is your energy. Your energy gradually recharges. Energy is used to refill your health and ammunition. It's much simpler than it sounds. ;) Just give it a try!