We have tried to display the vitality that is normally invisible as a numerical value (upper right corner of the screen) and gauge, and explain the strategy points in each scene with subtitles. Please turn on the subtitles. It is full of useful information for those who are just starting out.
You can also visually check the rules for slime spell timing and shooting direction.
The Tower of Druaga is not that difficult to play once you know the key points of the game.

This is not a super play video.
This is not a super play video, but rather a video of a player who has been exploring Doruaaga for many years (and is as good as they come) trying to reason his way through a single coin. Here is the secret behind his no-continue clear, even though he doesn't look like a very good player.

18:07 26th Floor Hyper Gauntlet
22:55 33rd Floor Blue Line Shield
25:34 37F Hyper Helmet
31:08 45th Floor Excalibur and Red Knight Battle
36:54 52nd Floor Hyper Armor
40:21 57th Floor: Succubus and Lizardman Battle
42:25 59th floor: Battle against Druaga
43:39 60th floor: Rescuing Kai - Ending

Translated with www.DeepL.com/Translator (free version)