The "Renryuu Ascension 22.03.15 [Android Version].apk" is ~1,05 GB.
The .apk is used to install the game, after which it might take more than 1.05 GB space on your phone. If you already installed the game before, you can use the newer .apk to update your game files.
If you have problems with the download on itch for some reason, you can also find the apk in the MEGA download folder: https://mega.nz/folder/CpQXwBDS#wwZlWRrPWoGzZX5h0-MlRQ