Install the boot splash theme and set up GRUB without Limine

default/plymouth/blob.plymouth

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+[Plymouth Theme]
+Name=Blob
+Description=Blob boot splash
+ModuleName=script
+
+[script]
+ImageDir=/usr/share/plymouth/themes/blob
+ScriptFile=/usr/share/plymouth/themes/blob/blob.script

default/plymouth/blob.script

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+Window.SetBackgroundTopColor(0.059, 0.063, 0.071);
+Window.SetBackgroundBottomColor(0.059, 0.063, 0.071);
+
+screen.width = Window.GetWidth();
+screen.height = Window.GetHeight();
+
+logo.image = Image("logo.png");
+logo.width = logo.image.GetWidth();
+logo.height = logo.image.GetHeight();
+
+scale_x = screen.width / logo.width;
+scale_y = screen.height / logo.height;
+
+scale = scale_x;
+if (scale_y < scale_x) {
+  scale = scale_y;
+}
+
+if (scale != 1) {
+  logo.image = logo.image.Scale(logo.width * scale, logo.height * scale);
+  logo.width = logo.image.GetWidth();
+  logo.height = logo.image.GetHeight();
+}
+
+logo.sprite = Sprite(logo.image);
+logo.sprite.SetX((screen.width - logo.width) / 2);
+logo.sprite.SetY((screen.height - logo.height) / 2);
+logo.sprite.SetZ(0);
+
+prompt.sprite = Sprite();
+prompt.sprite.SetZ(10);
+message.sprite = Sprite();
+message.sprite.SetZ(10);
+
+fun draw_prompt(text) {
+  if (text == "") {
+    prompt.sprite.SetImage(Image.Text(" ", 1, 1, 1));
+    return;
+  }
+
+  prompt.image = Image.Text(text, 0.8, 0.82, 0.85);
+  prompt.sprite.SetImage(prompt.image);
+  prompt.sprite.SetX((screen.width - prompt.image.GetWidth()) / 2);
+  prompt.sprite.SetY(screen.height * 0.82);
+}
+
+fun display_password_callback(prompt_text, bullets) {
+  dots = "";
+  index = 0;
+  while (index < bullets) {
+    dots += "*";
+    index++;
+  }
+  draw_prompt(prompt_text + " " + dots);
+}
+
+fun display_normal_callback() {
+  draw_prompt("");
+}
+
+fun message_callback(text) {
+  message.image = Image.Text(text, 0.8, 0.82, 0.85);
+  message.sprite.SetImage(message.image);
+  message.sprite.SetX((screen.width - message.image.GetWidth()) / 2);
+  message.sprite.SetY(screen.height * 0.9);
+}
+
+Plymouth.SetDisplayPasswordFunction(display_password_callback);
+Plymouth.SetDisplayNormalFunction(display_normal_callback);
+Plymouth.SetMessageFunction(message_callback);