I don't play much tetris myself, I wonder how the mismatch of the two sides feels for someone who is used to play tetris.
the new mechanics adds an extra difficult to the game
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I can only speak for myself (thus as a developer you might think i am biased, but i am completely honest here):
I always loved playing Tetris, however at some point it just feels the same, you know? Some people certainly can play a single game for decades, but i am more like a regular player, where i try to be the best i can be, but at some point just feel like there is nothing to gain from playing more. But with stuff like this it can bring back some of the excitement of the original game, plus gives you room to learn new skills. Essentially you can see this as a mod. Now that i have corrected most bugs, i think i will play this game for several hours the upcoming weeks.
And yes, it certainly is more difficult. Even playing at only half the speed of what i play at regular Tetris, i feel overwhelmed. But it also feels possible to beat, you know?