Some suggestions for the game (You don't have to add them)
Guns
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-Double Barrel Shotgun 10k coins / Duel Wield 20k coins
-Assault rifle 15k coins/ Duel wield 30k coins
-Rocket Launcher 45k coins / Duel Wield 90k coins
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-Maybe add some like rouge lite elements like an exp bar that fills up when killing enemies and when it does you can pick like one out of three different types of skills/perks?
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New Enemy types would also be nice
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Note I've never used unreal engine and BARELY know anything about coding. The most experience I have is in Scratch and Clickteam fusion.
Hope the game gets popular.