I've put about ten hours into it, escaping the underworld twice... I feel like it has a pretty good feeling of progression, better than most roguelikes. I did get a bit burned out after a few poor runs, as luck of the draw can be a significant factor I think... some of the gods just have better boons than others. And then sometimes you decide to collect a lot of coins instead of going straight for upgrades, and hardly ever get a chance to shop. Oh well, them's the breaks.
After 25 hours and 24 escape attempts, the credits have rolled! And yet I feel like there's still a good bit more left, even just story-wise.
I'm not sure it's even my top Supergiant game I played this year (I came away really impressed by Pyre) but I've already played it more than their previous three games combined, and am most likely to continue playing for a quite a while. They did a great job building a fully realized experience around the roguelike (roguelite?) foundation.