Antichamber is also a very fun adventure puzzler. It actually gives you tons of leeway even though it does have a linear path that's the easiest. I took maybe 6

Antichamber is also a very fun adventure puzzler. It actually gives you tons of leeway even though it does have a linear path that's the easiest. I took maybe 6 hrs on my first play through, but there are speed runs that go under 10 minutes.