A mediocre tool for decoding the runic language from the game Tunic

After downloading the latest release, or building the latest version from source, simply run it and a UI will appear:

The controls are as follows:

Left/Right Arrow       Move cursor left and right;
                       moving right at the end of a phrase adds more runes to the phrase

Backspace              Clear current rune & remove it from the phrase

Click                  on the lines in the central rune to toggle them on/off;
                       toggling the diacritic at the bottom will swap phoneme order

• Empty runes are treated as half-width spaces
• There is no punctuation support
• The phrase will cut off if it is too long

Huge credit goes to u/oposdeo who appears to have done a good chunk of the work of actually decoding the runic code. See their post here.