Maelstrom: Show an error if we couldn't initialize

SDL Commits
1 
From 94d33847b68912dba5e70731096a410027091986 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sat, 4 Apr 2026 08:58:19 -0700
Subject: [PATCH] Show an error if we couldn't initialize

---
 game/main.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/game/main.cpp b/game/main.cpp
index a1909085..678c0c91 100644
--- a/game/main.cpp
+++ b/game/main.cpp
@@ -222,6 +222,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 	/* Initialize everything. :) */
 	if (!StartInitialization(window_width, window_height, window_flags)) {
 		/* An error message was already printed */
+		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", "Couldn't initialize game", nullptr);
 		return SDL_APP_FAILURE;
 	}