Roadmap
Partially done

Done
Stage 1
Current stage (Alpha). This is what I'm working on now.
- Some refactoring, optimizations and fixes

- Animals

- Sound
- Combat

- Clothes, armor, armor stand

- Fire

- Item durability

- Fixing tools, weapons and armor

- Weather
- Coloring (with a brush)

- Distillery and squeezer

- Mobile item containers: crates, cardboard boxes, backpacks

- Fluid and gas recipes and containers

- Pipes, filtering, sorting

- Fish trap

- Logic circuits

- Sandbox building tools
- Other new items and blocks (everything before steam power)

- More console commands
- Wiki
Stage 2
Beta. Must-have features for the finished game.
- More refactoring, optimizations and fixes
- Writing (signs, books, etc.)
- Paintings/posters, maps
- Fishing rod, bow & arrows
- Hostile mobs
- Animal breeding, horse riding
- Music
- World map, waypoints
- Generated structures
- World customization
- More decorative blocks, more design table recipes
- Steam power, combustion, electricity, nuclear power, other industrial/sci-fi things
- Guns, jetpacks and explosives
- Naming mobs and weapons
- Status effects
- More console/server commands
- Achievements
- Linux launcher
- Better modding support
Stage 3
These are the would-be-nice-to-have features. Some may be implemented before 1.0.0, some - after, some - never.
- More refactoring for the god of refactoring
- More skins/character customization
- Some kind of quest/progression system
- Moon phases
- Alchemy, potions, enchantments etc.
- Ability to create everything (or almost everything) from nothing
- Waterlogged blocks
- Dimensions
- Space travel
- Even better modding support