All the way back in January of 2010, Ryan Mitchell Games released Necromancer Rising [Free], an RPG of impressive scale. Utilizing their own in-house developed "Soul Engine", the game comes packed with tons of content and customization while still being capable of running well on ancient iOS devices. The graphics look a little dated, but if you can get beyond that you'll be in for 60 hours of gameplay across 50 in-game dungeons with 49 different bosses.
Check out the trailer which shows a bunch of bosses, dungeons, and gameplay:
Anyway, the whole reason that this game is free is because of the launch of Mission Europa, a Sci-Fi themed title based on the same engine which has an additional year of development under its belt. Again, the graphics in Mission Europa are definitely rough around the edges compared to modern video games, but the amount of content and customization is crazy. The 50 hours of gameplay is comprised of 50 different levels over 5 episodes and 170 missions. Also included are 180 different enemies, 50 bosses, and 30 unique armor sets.
Give the trailer a look:
One odd thing about Mission Europa is that it comes in two different editions. First off, there's Mission Europa Collector's Edition HD [$9.99] and Mission Europa Standard Edition HD [$3.99] they seem to be the same game, but the Collector's Edition comes with all of the content while the Standard Edition has it for sale in-game via IAP.
It sounds weird, but people on our forums are absolutely in love with the game. It had a ridiculously huge thread in our upcoming games forum, and now that it's out there's an equally massive thread in our games forum. In addition, there's even a FAQ thread filled with forum members helping others with the game.
I'd definitely give Necromancer Rising a try first, as the game mechanics are similar enough that you'll easily be able to get a feel for whether or not you can deal with how the game feels before getting involved in Mission Europa. Either way, it's impressive seeing indie developers like this releasing games of this scope and scale, so swing by the forums and see what others are saying about the games.