hopefully this fixes it?

configuration.nix

@@ -9,7 +9,14 @@
     ./hardware-configuration.nix
   ];
 
-  nixpkgs.config.allowUnfree = true;
+  nixpkgs = {
+    config.allowUnfree = true;
+    overlays = [
+      (self: super: {
+        hyprland = inputs.hyprland-git.packages."x86_64-linux".hyprland;
+      })
+    ];
+  };
   nix.settings.experimental-features = ["nix-command" "flakes"];
 
   # Use the systemd-boot EFI boot loader.
@@ -45,11 +52,20 @@
       tree
     ];
   };
+  home-manager = {
+    useGlobalPkgs = true;
+    useUserPackages = true;
+    extraSpecialArgs = {inherit inputs;};
+
+    users.ashley = import ./home.nix;
+  };
 
   services = {
-    displayManager.sddm = {
-      enable = true;
-      wayland.enable = true;
+    displayManager = {
+      sddm = {
+        enable = true;
+        wayland.enable = ! config.services.xserver.enable; # experimental
+      };
       defaultSession = "hyprland";
     };
 
@@ -68,15 +84,22 @@
   programs = {
     hyprland = {
       enable = true;
-      package = inputs.hyprland-git.packages."x86_64-linux".hyprland;
+      withUWSM = true; # Universal Wayland Session Manager
+      xwayland.enable = true;
     };
 
+    gamemode.enable = true;
     steam = {
       enable = true;
-      remotePlay.openFirewall = true; # optional
-      dedicatedServer.openFirewall = true; # optional
-      localNetworkGameTransfers.openFirewall = true; # optional
-      gamescopeSession.enable = true; # optional
+      gamescopeSession.enable = true; # .desktop entry for gamescope
+
+      remotePlay.openFirewall = true;
+      dedicatedServer.openFirewall = true;
+      localNetworkGameTransfers.openFirewall = true;
+
+      # extraCompatPackages = with pkgs; [
+      #   proton-ge-bin
+      # ];
     };
 
     silentSDDM = {
@@ -104,9 +127,12 @@
     };
 
     # nvidia drivers
-    nvidia = rec {
+    nvidia = {
       package = config.boot.kernelPackages.nvidiaPackages.stable;
-      open = lib.mkOverride 990 (package ? open && package ? firmware);
+
+      # WARNING: whether to use open-source or proprietary kernel modules
+      # open = lib.mkOverride 990 (package ? open && package ? firmware);
+      open = true;
 
       nvidiaSettings = true;
       modesetting.enable = true;
@@ -122,6 +148,12 @@
   };
 
   environment = {
+    # NOTE: loaded earlier than `environment.variables`
+    sessionVariables = {
+      # Hint Electrons apps to use Wayland
+      NIXOS_OZONE_WL = "1";
+    };
+
     variables = {
       EDITOR = "nvim";
     };
@@ -132,6 +164,8 @@
       git
       neovim
       wget
+
+      steamcmd
     ];
   };