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!