If you want a real face-full of indie go install Desura and browse that thing's games catalog. Think Greenlight looks exotic? Pretty much anything on there that's in a releasable form is available on Desura. Currently I play Bunny Must Die (it finally got translated!) and Gentrieve 2, both Metroidvanias, on there. The Binding of Isaac and FTL are among the greatest games out there (of course available on Steam too).
AI War (singleplayer/coop RTS) has started to move again with the Ancient Shadows expansion that introduces hero units and special missions to take them onto. As always you can enter the alpha/beta/whateveryouwannacallit by buying it now and installing it on your base game.
A Valley Without Wind (Actraiser x Metroidvania) is undergoing a total rework that re-implements pretty much all mechanics of the old game (while removing some altogether and adding new ones) to build something that's more coherent. It's also getting completely redone art (this time not programmer art). The result will be AVWW 2 but anyone who owns 1 gets 2 for free. The changes are so major they didn't want to completely replace the current game (as a patch would) but they also didn't want to charge existing owners again.
The last Indie Uprising on XBLIG wasn't all that great but I guess these things just aren't as good as they're hyped up to be in advance. The guy who organized the Uprising also contributed the worst game, you might suspect that he organized it just to piggyback onto the quality of the other games. Anyway, I only picked up Xenominer so far. It's unfortunately a completely peaceful Minecraft clone but at least it has a programmable bot to handle repetitive tasks. I just wish it could be upgraded to be faster or cloned to have more bots.
Why are so many indie games on mobile devices "casual" games? You don't see games like Cave Story, Limbo, OutLand, Mighty Switch Force, VVVVVV, etc. on iOS or Android. Most of the indie games on mobile devices are overly-simplistic crap like Angry Birds, Cut the Rope, bubble shooters (think Bust A Move), etc.
Why can't indie developers be more creative with their mobile games like they are on PC and consoles?
Because people turn into a pile of casuals when they pull their phones out and start ignoring anything that doesn't fit the casual template. Try Mission Europa (it's ugly but that kinda fits its setting) or Star Traders RPG.
Also quit treating your opinion as some kind of universal truth and the only interesting fact about a huge swath of gaming.