It's an amazing mod for b1.7.3 based around the Indev/Infdev days, being what Minecraft could have been if Notch added all of his original ideas into the game, and also some more modern scrapped stuff.
Some of the stuff I can think about is
- Redstone is nowhere to be seen, replaced instead by a fully developed implementation of the Gears
- Mooshroom is in
- More basic terrain generation, but the feeling of loneliness is amplified
- Some extra spooky stuff that can happen at random for extra early MC fear
- Some of the unused music from the Minecraft Volume Alpha is now in the game
- Every block you break, every block you place,
I'll be watching yougives you points
If u can, u should give it a go! So far it can only be downloaded through it's Discord server but it's worth it.