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It needs a thing where you can upgrade and fight bosses every 10 levels and the game would be pretty good add some special abilities and then you have made a good game.
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Sword Slasher appears to be a legitimate app. AppsHunter Legitimacy Score for Sword Slasher is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.