For atari 8 bits version when my dear Haplo ?
No, the issue is not the available RAM. The first hurdle is that Atari supports only 128 characters (tiles), while this game uses 256. This means the text mode used on C64/Plus4 cannot be used on Atari, and the 6502 code base needs to be changed to switch to graphics mode on Atari and manually render the tiles to the screen.
The second limitation is that Atari only allows two colours in the 320x200 screen mode, while C64/Plus4 allow 16/121. This wasn't a problem on Tenebra and Shift because they only use two colours, but Binary Battle uses more. This means that either some of the features need to be dropped for Atari, or the whole interface needs to be redesigned to fit in one of the smaller resolutions and the 6502 code base changed to deal with it.
So although an Atari port is definitely possible, it will not be straightforward.