Correction about this spritesheet. The version was mistyped, it was supposed to say '6.4' not '4.5', as 6.4 was the last if not one of the last versions of this game to exist online. Any versions prior were either lost or their assets cannot be confirmed to be real. The number 4.5 came from a mix of misremembering the numbers and actual version numbers in prior versions of the game. Older versions of the game had very different sprites for the title screen, but since this is the most up to date HUD from the game, they wouldn't fit here anyways. 6.4 is also the last official bugfix/maintenance update for the 'Hive Edition' (or at least that is what it is dubbed) of the game.

So what about this sheet's layout. Why is it the way it is?
The HUD was split into several parts to be used as overlays over the main 'astro' HUD element. In the game, the alien's side would show the green elements over the astro one (originally having too much wasted white space in the sprite). The 'WIP' sprite was used for internal versions, likely never seen until the flash game was ripped and assets from the developers were shown to specific people here and there. These sprites came from the game itself. The yellow and black sprite was used for a temp. overlay showing 'Aliens Side Coming Soon' or something similar, which was removed when the alien's story mode came out years ago (most old sprites from certain versions remain in the 'hive edition'). The hive sprites are in-fact real, and have been uploaded on this website; check them out here: https://www.spriters-resource.com/browser_games/legomarsmissioncrystalienconflict/sheet/144307/

In terms of other menu sprites and the like... well, Flash Player Director had a lot of movie features that games could use for special effects, such as stretching, moving, basic stuff. 'Shader' like things were also used in the game. A lot of visuals were achieved using movie clips, but some were in fact programmed (not many as far as I know). So if you know what the game did to these sprites using effects, well, then you will know the sprites themselves aren't that impressive without them.