BuildCraft 0.6 has now been released on my itch.io page. It is now an executable but it must stay in the folder. The sky no longer works properly so there will be new sky textures in the next version.
Controls for BuildCraft 0.6
W to move forwards
S to movebackwards
D to move to the right
A to move to the left
0-9 for most block types
Q-U for other block types
Minus for logs
Backspace for cobblestone
Changes in 0.6
You can no longer jump up 2 full blocks
The player height is now 2 blocks tall rather than 2.5 blocks tall
The world size has been increased by 25 blocks in each direction
You can now press Shift and Q to close the game
Note: Every time you load up the game you will get an error " WARNING File Already Exists But Should Not " just click ok a few times then the game will start
Link:
https://Aidanlovesminecraft.itch.io/BuildCraft