@dmk As for finishing waves in time, it's relatively difficult to clear an entire wave atm.

The lines descend automatically as soon as the previous line is cleared or goes off-screen. I recently increased the descent speed of the lines for pacing reasons, but it does indeed make completely destroying a line difficult.
I feel like it forces players to prioritize danger, but I'll also look into that further.

@dmk Thanks so much for your feedback! I'm really glad you like it.

Regarding the score displayed on the 'game over' screen, it only really counts from level two onwards. I set it up this way so that when you die, the score resets to the score that was true at the beginning of the level where the player dies.
So if the player dies on the first level, only their run time is displayed...
I'll take a closer look at this and see how I can modify it.