diff --git a/glugun/index.js b/glugun/index.js
index 6951ff8..9f73cdf 100644
--- a/glugun/index.js
+++ b/glugun/index.js
@@ -1,13 +1,56 @@
-import { cp, writeFile, readFile, readdir, rm } from 'fs/promises';
+import { cp, writeFile, readFile, readdir, rm, mkdir, stat, access } from 'fs/promises';
 import { join, dirname } from 'path';
-
 import { fileURLToPath } from 'url';
 
+import * as Esbuild from 'esbuild';
+import * as HTMLMinifier from 'html-minifier-terser';
+
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 
+const rgb = (r, g, b, msg) => `\x1b[38;2;${r};${g};${b}m${msg}\x1b[0m`;
+const log = (...args) => console.log(`[${rgb(235, 69, 158, 'Glugun')}]`, ...args);
+
+const minifyBackend = process.argv.includes('--minify');
+
+const esbuildPlugin = { // esbuild to fix some things in src files
+  name: 'glugun-esbuild',
+  setup(build) {
+    build.onLoad({ filter: /\.js$/ }, async (args) => {
+      let source = await readFile(args.path, 'utf8');
+
+      source = source
+        .replace(`const __filename = fileURLToPath(import.meta.url);\r\nconst __dirname = dirname(__filename);`, ''); // remove setting __filename/__dirname cause ESM -> CJS
+
+      return { contents: source };
+    });
+  }
+};
+
+const exists = path => access(path).then(() => true).catch(() => false);
+
+const dirSize = async dir => {
+  const files = await readdir(dir, { withFileTypes: true });
+
+  const paths = files.map(async file => {
+    const path = join(dir, file.name);
+
+    if (file.isDirectory()) return await dirSize(path);
+    if (file.isFile()) return (await stat(path)).size;
+
+    return 0;
+  });
+
+  return (await Promise.all(paths)).flat(Infinity).reduce((acc, x) => acc + x, 0);
+};
+
+
 const buildDir = join(__dirname, '..', 'build');
 const _buildWin32 = async (name, dir, attrs) => {
+  // reset build dir
+  await rm(buildDir, { recursive: true, force: true });
+  await mkdir(buildDir, { recursive: true });
+
   await cp(dir, join(buildDir, 'src'), { recursive: true }); // copy project src to build
   await cp(join(__dirname, '..', 'gluon'), join(buildDir, 'src', 'gluon'), { recursive: true }); // copy gluon into build
 
@@ -20,25 +63,53 @@ const _buildWin32 = async (name, dir, attrs) => {
     }
   }
 
-  await writeFile(join(buildDir, `${name}.bat`), `node src`);
-
   // await writeFile(join(buildDir, 'gluon_info.txt'), `Gluon 0.1, built with Glugun 0.1 (win32 ${attrs.join(',')})`);
   let indexContent = await readFile(join(buildDir, 'src', 'index.js'), 'utf8');
 
   indexContent = indexContent.replace('../gluon/', './gluon/')
-    .replaceAll('GLUGUN_VERSION', '1.0')
+    .replaceAll('GLUGUN_VERSION', '2.1')
     .replaceAll('SYSTEM_CHROMIUM', attrs.includes('system-chromium'))
     .replaceAll('SYSTEM_NODE', attrs.includes('system-node'));
 
   await writeFile(join(buildDir, 'src', 'index.js'), indexContent);
+
+  await writeFile(join(buildDir, `${name}.bat`), `node %~dp0${minifyBackend ? 'out.js' : 'src'}`);
+
+  if (minifyBackend) {
+    log(`pre-minify build size: ${((await dirSize(buildDir)) / 1024 / 1024).toFixed(2)}MB`);
+
+    await Esbuild.build({ // bundle and minify into 1 file
+      entryPoints: [ join(buildDir, 'src', 'index.js') ],
+      bundle: true,
+      minify: true,
+      format: 'iife',
+      platform: 'node',
+      outfile: join(buildDir, 'out.js'),
+      plugins: [ esbuildPlugin ]
+    });
+
+    const htmlPath = join(buildDir, 'src', 'index.html');
+    if (await exists(htmlPath)) {
+      const content = await readFile(htmlPath, 'utf8');
+      writeFile(join(buildDir, 'index.html'), await HTMLMinifier.minify(content));
+    }
+
+    await rm(join(buildDir, 'src'), { recursive: true }); // delete original src
+  }
 };
 
 export const build = async (name, dir, platform = 'win32', attrs = 'system-chromium,system-node') => {
-  console.log('building...', name, dir, platform, attrs);
+  log('building', name, 'on', platform, 'with', attrs.split(',').join(', ') + '...');
 
+  console.log();
+  const startTime = performance.now();
   switch (platform) {
-    case 'win32': _buildWin32(name, dir, attrs.split(','));
+    case 'win32': await _buildWin32(name, dir, attrs.split(','));
   }
+
+  console.log();
+  log(`finished build in: ${((performance.now() - startTime) / 1024).toFixed(2)}s`);
+  log(`final build size: ${((await dirSize(buildDir)) / 1024 / 1024).toFixed(2)}MB`);
 };
 
 const [ name, dir ] = process.argv.slice(2);
diff --git a/glugun/package.json b/glugun/package.json
new file mode 100644
index 0000000..71aac00
--- /dev/null
+++ b/glugun/package.json
@@ -0,0 +1,7 @@
+{
+  "type": "module",
+  "dependencies": {
+    "esbuild": "^0.16.3",
+    "html-minifier-terser": "^7.1.0"
+  }
+}
\ No newline at end of file