Hey, thanks for your feedback!
The count is meant to make passing a level a bit harder and increasing the pace a bit. But I agree, the counter is a bit small and likely to be overlooked.
I've already taken into account that 4x1 pieces are more important for this variant of Tetris, so I have assigned specific probabilities to make the 4x1 more likely to be picked than other pieces. If you're interested here are the corresponding constants for the probability (the higher the more likely) in the code: https://github.com/Fju/TetrOut/blob/master/scripts/tetrout.gd#L122
Have a nice day!