The iPad version of House of the Lost [Free (HD)] hit last October, and it has taken F5 Games until now to get the pint-sized version out for the iPhone. House of the Lost Mini [Free] is the same game, but trimmed down to the smaller screen of the iPhone. It's really hard to say which version of the game we like better, as both seem to be really fun.
In a nutshell, House of the Lost feels like an approachable roguelike, almost in the same vein as Spelunky on home consoles. It has a top down view, and a totally randomized house filled with monsters to kill, weapons to pick up, keys to find, doors to unlock, and bosses to kill. Brad and I had a lot of fun with it, and best yet, it's totally free to try with a $2.99 IAP unlock to get access to the rest of the game if you also find yourself enjoying it.