Have you ever used a game for foreplay? Why do most of them feel so "off"?

My wife and I tried different apps and dice games a while back, but they always felt clunky or killed the mood.
I'm currently in the middle of launching a PoC (Proof of Concept) called Touch Marathon to fix this, and I need an objective opinion—not just mine or my AI assistant's.
For those who use games to spice things up: What is your experience? Even if you found one you liked, what do you feel is still missing? Is it the pacing, the variety, or the "natural" flow?