Damn this game is hard to run. I tried running it on wine, on protontricks and the only thing that worked in the end to run it on my linux machine was adding it to steam as a non linux game.
After that I enjoyed playing. The sound gets a little repetitive, but overall the gameplay is fun.
You still have a long way to go, until its ready for commercial sale.
Some feedback: -The repetitive firing sound is a little annoying -The performance and optimization is lacking -Unreal engine 4 is outdated but it gets the job done. Although you should move to unreal engine 5. (nitpick) -Music playing would be nice. -Hover effects on the buttons are almost necessary. -The spawning of the enemies is a little unfair. Too many spawn and having them all go towards the player at all times no matter what makes the game very hard to keep playing. -The reload speed upgrade should have a limit at 0, otherwise the player could upgrade it into negatives. -The font is a little childish and boring (nitpick)
Overall, I encourage you to keep working on this! It’s a nice idea, even though the backrooms trend might be a little stale by now. Good luck!