As an old Heretic fan, I am liking this a lot. Thanks for all the hard work on this project! I really like the background/sky texture that I have seen in the first couple levels -- definitely gives the game a distinctive feel compared to the original Heretic.
I just finished the first level and I like what I see, a lot. Heretic was always my favorite FPS as a kid in the 90s (more so than Doom, I always preferred Heretic's high fantasy setting). I'd love to see more great Heretic levels like that.