Indie developers are always on the lookout for people to give them feedback, so it's not uncommon for them to release a public alpha. All the better for you!
In the video above, I play the alpha for a dungeon crawler called Vagante by Nuke Nine games. It's still being worked on, but even in its current state it has a buttload of charm. If you took Spelunky and added an RPG levelling and equipment system, this is what you would have.