finally had the time to complete this, good ending (despite not better)
all fine, apart you need to turn off bgm via options before the end sequence
or the sequence itself freeze at this point :

- cave.png (9.99 KiB) Viewed 920 times
turning off bgm instead, the sequence plays fine and also the credits music is enabled the same
so not a real issue, the game is completable also

- cave2.png (8.36 KiB) Viewed 920 times
all this possibly have been fixed in this cdda release
great game, had great fun n challenge replaying it