The whole atmosphere with the desert wasteland, zombie horde, and music is feels really good. I thought that the music was maybe a little bit bit too happy-sounding, but it had a vaguely creepy quality that worked well.
And I thought that saguaro looked familiar! We used the same tileset.
I did my first run not realizing that there was a gun in the game or that I could boost through obstacles. I'm sure those are handier on the higher difficulties. But I thought that the way the gun is utilized, giving an incentive for just holding the trigger and pointlessly spraying bullets into the horde felt a bit out of place.
Anyhow, this was a simple but cute little game!