Thanks for your time and feedback. I agree that the current tutorial is not sufficient or even superfluous on some aspects. I'm gathering good feedback each DD and hopefully I find a good and durable direction to make it clearer (both in what I'm going to do and how to present it).
At some point I had the wish to make several Towers with specific contents. In the current version it's oriented to be 1 Tower with randomized content (each beaten boss opens to a randomisation and new Opportunities unlock, but I'm not sure anybody witnessed it yet). If I can at least involve the player in a better way to climb the Tower I'd be happy to add Opportunities with varied mechanics (combos/reflex/backtrack/stats/confusion...) and persistent contents.
I'll keep at it bringing your encouraging words.