This is genuinely amazing. I stumbled into one secret room by accident early on and ended up trying to look into every nook and cranny I could just to see what else I could find. The controls were fluid and consistent (I had to use keyboard) and there was a small amount of entertainment from smacking into walls while running. The minimalist aesthetic works so well, it built a good atmosphere and everything that could be interacted with was very obvious, and it ran smoothly.
+1 for Linux support!