Nice reinterpretation of tetris. The execution is also good. But I don't use the store because it took time to get the points. Maybe the incrementation of the speed should be a little bit faster.
Another thing that maybe could do the game "faster" is that the piece is falling, also increase the speed over time, I don't mean the global speed of the game, I'm refering only for that specific piece, because I abused a lot of the "perpetual" falling to spot a good place to put the piece.
But these are details, the gameplay is polished
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Thanks for playing! I've added a cheat code, you can press "c" to get instant credits on settings screen and try out the upgrades. A lot of players have been suggesting making the game faster, which I agree with and if I continue working on this game, I will try out balancing the game speed and other factors to polish the difficulty and maybe add other game modes and difficulty levels. The specific piece speed increase over time is a great idea, maybe a force hard drop after a couple of seconds? I'll definitely think about it as well. Thank you for the feedback!