I like the idea of "unlocking gameplay features" - it fits the lost and found theme really well too.
Unfortunately, I'm not the biggest fan of what one might call "maze gameplay"🏃♀️.
Edit: If you want to develop more games in the future: I personally would recommend not hiding "player convenience features" (like running) behind walls (like upgrades). It's very tempting because it *feels* like a real upgrade. But it's also really difficult to pull off well.
You've probably created this convenience because you know it's a good feature - it's made your game better. But since it's an upgrade, you didn't make it accessible from the start. I also struggle with this when I develop games with upgrades.