Dealing With Your Demons is a new 2-part fantasy RPG adventure using the OGL that's up on Kickstarter now. The first half is designed for characters level 1-4 while the other is for characters 4-8. It's got many classic elements thrown in to give you just the game style you love.
From the campaign:
Welcome! Dealing With Your Demons is a 16,000 word (around 40 pages) 5E OGL adventure in two-parts. Part One is designed for levels 1-4 and Part Two is designed for levels 4-8. The first part of the adventure has the party delving into a classic dungeon, intent on rooting out long lost treasures. However, things are not quite what they seem and the demon the party destroys in the first act may be something quite different from what they are led to believe. The adventure is designed to be placed into any setting, though it does present a city, Par-Lar Dur, and some locations that can be modified to meet many needs.
At its heart, Dealing With Your Demons is a story about cultural misunderstanding and colonialism, but told through a classic dungeon crawling lens. It's also a story about kobolds, one of my favorite species in all fantasy RPGs.
The campaign is up and running now and is set to go for another 29 days.