Thanks for your feedback! I'm glad you liked it.
Yes, you're right, the UI and explanations need improvement. 'Mana' is exactly the number of plays you can make; when you run out of mana, you lose.
I hid this on purpose, but here's a tip: if you do quadra/quadra/quadra or 4 straight/quadra/quadra, you'll do the TEKANO combo (x4 multi), and if you do penta/penta/penta or 5 straight/penta/penta, you'll do the TEKO combo (x5).
Yes, I also know that at first the game is a bit overwhelming, too many elements on screen and too much contrast. Thanks for your feedback! I'm always paying attention and want to improve even more.