Two new dimensions introduced. The Reimagined and Underworld. Both have a lot for exploring. There are new ores, weapons, mobs, tools, structures and mechanics. Many new blocks can be made with the items from the new dimensions. Mobs are tougher and Weapons are stronger, so is armor. Added custom RGB watermelon. The experience is basically the Overworld, but still different. Most mobs and materials are alternatives to the vanilla items, blocks, mobs etc. Also a biome is added to the End which has a ruined portal to the Reimagined. To go to the Underworld u need Bedracite Frames (currently doesnt have an implemented recipe) You can get bedracite as an ore above bedrock level. It makes Ender Dragon roars when nearby. Can be mined only if u have Breakness on your Pickaxe/Hammer (It's an enchant). There are scrolls which show u the recipes you will need for bedracite chunks, ingots, tools and other additions including a new Enchanting Table.
First Version 1.0
Now 1.1
If u have any questions feel free to ask.