I don't know actually a perk system would be fun like that you have replayability, and choicies for the player to make. So yeh I prefer it to be permanant. And why not different shotgun with different powers ?
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Oh, that is intriguing! Having to make a shoice between, for example, higher knockback or an extra bullet with less knockback could be very exciting. Changing the shotgun visually also sounds like a good idea to go with it. Thank you very much for the suggestion, will talk to the other team members about this! :)