When it shoots you, duck and aim your gun to the flower that shoots the bomb, not the boss. When you reached the 2nd phase, concentrate on the ground as it shows where the lightning strikes. On this part, just shoot straight.
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you can modify it. go to the file “LocalLow”. If you don’t know how, google. In that file, you’ll see a file named “Jashinn”. Click on that and then choose the save file you want to modify. Save it and load the file in game. Find something with the rifle and change the number behind the “=”. You can put any number you want.