Today we have some updates to the final boss, including a bugfix that I think was maybe introduced in one of the 2.X updates. Hopefully this resolves the issue:
Version 2.3 - December 20, 2022
Fixed issue with no items medal not unlocking during the final boss.
Final boss HP down from six hearts to five.
Added additional five seconds to attack phase.
Khimera: Puzzle Island version 2.2
This version introduces more fixes to the Japanese translation based on user feedback.
Version 2.2 - February 25, 2022
Further adjustments to Japanese translation.
Fixed buttons for scrolling lore entries showing off-screen in Japanese version.
Khimera: Puzzle Island 2.1
Thank you to everyone who played the Japanese translation of Khimera: Puzzle Island! Today's update fixes some typos and mistakes in the dialogue.
Version 2.1 - February 5, 2022
Japanese language typo fixes.
Khimera: Puzzle Island 2.0 - Japanese Translation
Khimera: Puzzle Island version 2.0 is now available! This new version fixes a few bugs and introduces a full Japanese translation by the wonderful Reallei, making it the first Suits & Sandals game to be available in a language other than English!
Changed 'Skip cutscene' message to use button icons instead of text.
fixed sound and music sometimes crackling as the game attempts to play the song and then immediately lower the volume.
Fixed item medals not appearing in credits statistics.
fixed all gold medal times achievement not unlocking if you were under one second from missing gold on any of the puzzles.
Some Canadian spellings removed.
Swapped flashing effect when selecting puzzles to something easier on the eyes.
Khimera: Puzzle Island version 1.6
Version 1.6 coming at you with a few minor fixes. Depending on your system, it may fix any fps issues you've been having.
Version 1.6 - April 11, 2021
Fixed timing issue causing the game to lock at 50 fps on some systems.
Fixed typo in credits.
Added functionality to enable/disable an FPS counter with F4.
Khimera: Puzzle Island version 1.5
A new version of Khimera: Puzzle Island has been released today bringing with it a host of changes and additions dedicated to improving the keyboard/game pad experience.
Version 1.5 - March 23, 2021
Added functionality for EMPTY and NOTE buttons to close the achievement menu.
Added option to adjust cursor speed in puzzles.
Defaults for cursor speeds set to 25 and 5 from 30 and 6 for initial delay and subsequent delays respectively.
Fixed not being able to select hints with keyboard/game pad when auto-hints are off.