Hello Golden! Thanks for taking the time to play around with my project and for the kind words. I am glad you liked the visuals, as it was where I put most of my effort and it was my first attempt at pixel art. Hopefully I'll be able to make a fun little shooter out of it, with time.
The hitbox is indeed a little smaller than the sprite, as it is custom with 2D shooters although you are right in assessing that it's not clear where it actually is (mostly the face area). I might probably just make it the whole cactus. Thanks for the feedback!