this game looks promising some ideas:
1.Try to make it a stealth game (maybe)
2.more simple maps (with verticality)
3.nps with clothes included in gore for example, guy get shot clothes rip
4.work on the guns and weapons more, add melee weapons like hammers ,knives
5.make the nps more alive for example you can get into gun fights or knive fights with npcs
the most important is 3,4 and 5 think of garbage day if you ever heard its a sandbox game with gore, very simple and its discountinued i hope this game becomes a better version of garbage day!