I liked the bullets staying on the stage, shooting feels really good!
The soundtrack was very pretty and the sound effects felt alright. Also, kudos on adding the music/sound controls, it was simple and functional! The level changing sound felt a bit too sharp, and it took me some time playing to understand where it was coming from.
It is really fun, except when you are on the floor and try to shoot up and sometimes the bullets/shots seem to travel through the floor and the character doesn't move up, I lost one run like that. Not that it matters much as I never made it further than 33 ghosts. Also, the ghosts that seemed stunned sometimes felt like immune to bullets. I felt like shooting then when they were moving was the only effective way of killing them.
I liked the ghosts (seemed cute!) and the effects overall. Nicely done! My only complaint visually would be that I feel a health bar or some other sort of meter would be a better way to go to visualize health, the computer face changed when taking damage but it wasn't clear how much I got left.
You probably already know it, but once you die you can continue playing and the levels keep on increasing, I died at level 7 and kept on being hit by ghosts coming up, a while later the counter showed level 9 even though I was still at the game over screen.
This was a fun shoot to move game! Congratulations!