diff --git a/flake.nix b/flake.nix
index 2c392d27..bc9ead2b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,16 +1,69 @@
 {
+  description = "VoxelCore – voxel game engine in C++";
+
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system: {
-        devShells.default = with nixpkgs.legacyPackages.${system}; mkShell {
-          nativeBuildInputs = [ cmake pkg-config ];
-          buildInputs = [ glm glfw glew zlib libpng libvorbis openal luajit curl ]; # libglvnd
-          packages = [ glfw mesa freeglut entt ];
-          LD_LIBRARY_PATH = "${wayland}/lib:$LD_LIBRARY_PATH";
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        voxel-core = pkgs.stdenv.mkDerivation {
+          name = "voxel-core";
+
+          src = ./.;
+
+          nativeBuildInputs = with pkgs; [
+            cmake
+            pkg-config
+          ];
+
+          buildInputs = with pkgs; [
+            glm
+            glfw
+            glew
+            zlib
+            libpng
+            libvorbis
+            openal
+            luajit
+            curl
+            entt
+            mesa
+            freeglut
+          ]; # libglvnd
+
+          packages = with pkgs; [
+            glfw
+            mesa
+            freeglut
+            entt
+          ];
+          cmakeFlags = [
+            "-DCMAKE_PREFIX_PATH=${pkgs.entt}"
+            "-DCMAKE_INCLUDE_PATH=${pkgs.entt}/include"
+          ];
+
+          installPhase = ''
+            mkdir -p $out/bin
+            cp VoxelEngine $out/bin/
+          '';
         };
-    });
+      in
+      {
+        packages.default = voxel-core;
+        apps.default = {
+          type = "app";
+          program = "${voxel-core}/bin/VoxelCore";
+        };
+      }
+    );
 }
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index 60cee6c4..08dfcf40 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -538,6 +538,7 @@ void Hud::closeInventory() {
     exchangeSlotInv = nullptr;
     inventoryOpen = false;
     inventoryView = nullptr;
+    secondInvView = nullptr;
     secondUI = nullptr;
 
     for (auto& element : elements) {
@@ -597,6 +598,9 @@ void Hud::remove(const std::shared_ptr<UINode>& node) {
         }
     }
     cleanup();
+    if (node == secondUI) {
+        closeInventory();
+    }
 }
 
 void Hud::setDebug(bool flag) {
diff --git a/src/graphics/core/Batch3D.cpp b/src/graphics/core/Batch3D.cpp
index 8f222a51..df6fdef7 100644
--- a/src/graphics/core/Batch3D.cpp
+++ b/src/graphics/core/Batch3D.cpp
@@ -126,7 +126,15 @@ void Batch3D::sprite(
     float scale = 1.0f / static_cast<float>(atlasRes);
     float u = (index % atlasRes) * scale;
     float v = 1.0f - ((index / atlasRes) * scale) - scale;
-    sprite(pos, up, right, w, h, UVRegion(u, v, u+scale, v+scale), tint);
+    sprite(
+        pos + right * w + up * h, // revert centering
+        up,
+        right,
+        w,
+        h,
+        UVRegion(u, v, u + scale, v + scale),
+        tint
+    );
 }
 
 void Batch3D::sprite(
diff --git a/src/graphics/render/TextsRenderer.cpp b/src/graphics/render/TextsRenderer.cpp
index 9e4210df..4b905e13 100644
--- a/src/graphics/render/TextsRenderer.cpp
+++ b/src/graphics/render/TextsRenderer.cpp
@@ -51,6 +51,7 @@ void TextsRenderer::renderNote(
     glm::vec3 yvec = note.getAxisY();
 
     int width = font.calcWidth(text, text.length());
+    int height = font.getLineHeight();
     if (preset.displayMode == NoteDisplayMode::Y_FREE_BILLBOARD ||
         preset.displayMode == NoteDisplayMode::XY_FREE_BILLBOARD) {
         xvec = camera.position - pos;
@@ -96,8 +97,11 @@ void TextsRenderer::renderNote(
 
             pos = screenPos / screenPos.w;
         }
-    } else if (!frustum.isBoxVisible(pos - xvec * (width * 0.5f * preset.scale), 
-                                     pos + xvec * (width * 0.5f * preset.scale))) {
+    } else if (!frustum.isBoxVisible(
+                   pos - xvec * (width * 0.5f) * preset.scale,
+                   pos + xvec * (width * 0.5f) * preset.scale +
+                       yvec * static_cast<float>(height) * preset.scale
+               )) {
         return;
     }
     auto color = preset.color;
diff --git a/src/logic/scripting/lua/libs/libhud.cpp b/src/logic/scripting/lua/libs/libhud.cpp
index 988685cc..432d8eb6 100644
--- a/src/logic/scripting/lua/libs/libhud.cpp
+++ b/src/logic/scripting/lua/libs/libhud.cpp
@@ -46,7 +46,7 @@ static int l_open(lua::State* L) {
     }
     return lua::pushinteger(L, hud->openInventory(
         layout,
-        level->inventories->get(invid),
+        lua::isnoneornil(L, 3) ? nullptr : level->inventories->get(invid),
         playerInventory
     )->getId());
 }