Pathos is a keeper. Pretty much nethack, without all the complexity, but with a nice interface. A fair bit easier, but with enough quirks to keep it interesting.
Event Horizon is good as a loot grinder too. If you like real time, top down, space combat that is (I do). It's not really rogue'ish, other than the randomized galaxy and loot. It also has a fairly slow start. Then as soon as you get over a little hump, you start getting all the cool stuff. There's no actual point to the game other then getting better ships and parts and fighting stuff, but it's still good for all that. You can get some quite varied ships and playstyles going, all in one fleet, so you can pretty much play it how you want. Fighter carriers, long range heavy missile ships, fast missile skirmishers, torpedo strafers, gunships, close range brawlers, snipers, or just some weird whacky stuff (black hole generator bombers that also lay plasma minefields around the black hole, etc) are all possible, or any combo of them in one ship in many cases too. The "perfecting" of ship designs and general hording of loot are pretty much the fun. I like that stuff, so if you do, you'll love it. There's also an ever increasing, but player chosen, level of challenge available, with a large variety of enemies, so it doesn't get old too quickly. Once you know about the interface and what some stuff does, it's easy. There's a big wiki and a helpful forum if you're unsure of what things do.
The others can just sort of sit there on your phone until you want to bust out a few levels. They're not that big, and I think only G&D requires an internet connection.