Love the visuals of this game, the explosions are satisfying and everything looks cohesive. I love this style of shooter and this a great take on it with a single control! I think it could really benefit from an endless mode where you keep going until you run out of health, I found myself wanting to keep on playing :)
One thing I'd suggest is that 10 health is a bit too much for 30 seconds, I found it difficult to get a game over within that time. Really solid game though, well done!