Hey. Downwell is made in GameMaker, so it's very hard to mod the game by editing the files.
You could however make a mod with Cheat Engine, by editing the memory values. :)
Yes, use the latest armloader9hax.bin always. After you have it there and you are in Luma mode, you can install Luma Updater (here) to update from console. No need to hassle with FTP/SD Card.