Thanks a lot for taking the time to test it, and for the detailed notes! You’re right about the HUD: it counts the gems you’ve freed, so “Gemas restantes: 0 / 4” is misleading. I’ll change it to “Gemas liberadas” (and add an English version of the labels) in the next update. Glad to hear dragging feels right. If you get a chance to finish a level later, I’d love your take on the difficulty. And if you have a game you’d like feedback on, send me the link and I’ll play it!
Also I will be working on the English language for the game.