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Click on the game window to enable keyboard controls. Use the arrow keys to walk. Press and hold Z to shoot. Press X to select/interact. Hold control for quick acces to certain items, or press backspace to open the inventory. Hold shift to view a minimap, once you unlock the map system item. Press enter for more options.
If you have a Gameboy Advance flash cartridge, I would recommend that you play the game on a real device. Web-browser based emulation can only be so accurate.