Yes, compare the classic bfnsp with beta 1 with all the teasers, content and the floor builder (which in alpha 5 was just changing textures and that's it) the game changed a lot, so yes, the game was remade many times, alpha 6 demo (it didn't look anything like alpha 5) final alpha 6 (it didn't look like the demo either but it did a little bit) beta 1 (I couldn't tell you but remembering the 3D doors, lightning and noise system and the massive floor builder the changes are extratospheric.