This was pretty fun. One thing that stood out was how incongruous that last sound effect was with respect to the rest of the game. It's a bit of a jarring tonal shift, like a toll-booth on a roller coaster.
Thanks! Yeah, I wanted to create a startling, dissonant ending, by contrasting the sad final statement with the cheesy sound effect and fireworks from Windows XP Solitaire. But if it felt unintentional, then I pushed it either too far or not far enough.
