100% this. I'd argue that most artsy games have that problem. Bioshock Infinite, Spec Ops, Braid, walking simulators. They all take the barest, most surface level of something clever, and then stop. As if that initial idea was enough to carry an entire project.
We can do this right now. How about a game with clear good and evil choices, and at the end it turns out all the good choices actually ended up making you evil, and all the evil choices ended up being good. I know I've basically described Fable and Spec Ops there, but since when has lack of originality stopped art games? Do it with enough earnestness, and we'll rake in those awards.
Let's mix this up. How about a racing game where the goal is to come in last. The game doesn't tell you this until you win the championship and the trophy goes to the loser. Way to subvert expectations! Maybe put out a blog post about how we wanted make the players think about what matters in life, and that the goal was to get players to stop and smell the roses.