Gameplay is fine but it's rather slow, and enemys can spawn on one side of the screen then on the other side, meaning you'll have to take some hits no matter what in the later rounds.
Thanks for the feedback, it may be too slow at the beginning even if I did want to ease people into the play, so that's something I may look at updating. However, a hectic (with a bit of luck also) ending is something I did want for the game!