Build 2.0.0 is the release you may have seen called BETA 1.5 (or BETA 1b)
Build 2.1.0 is a new update for the ongoing Beta (think BETA 1c).
Build 3.0 is would you would call BETA 2.0 (or BETA 2a)
Changes from B200 to B210:
- Added three new levels to Story mode.
- Fixed the Shield Cannon's death explosion ~ Centred and reduced in size.
- Added more environment upgrades (shown in new levels).
- Removed health power ups.
- Fixed spawn box on level 8 (boss level).