Hey, thanks for the feedback!
The idea of daily puzzles was popularized by Wordle and the New York Times games, probably not known by everyone, but I quite like the approach of playing a game in short bursts every day, that's why I designed Cryptyles like that. Puzzles reset every day at 0 UTC, but once all modes are unlocked there are 3-4 puzzles each day to play.
I can imagine the game might be confusing if you skip the tutorial message hah, I'll try to think of something to not make it closable by accident. You can also click on Help/? at the top to view it again.
The first mode is actually already the training mode, but in a future update this will be made more clear and easier (the whole game difficulty will be made a bit easier by default too).
Thanks for giving it a try!