After a little pause i tried this game again and still got stuck after the second camel wave after the cats. But from that what i've seen i can say that:
The graphics looked great and with a little bit more time you probably would have fixed the animation of the gun too ;-).
The game idea didn't just fit the theme but was also pretty nice to play even though it was a bit buggy (The respawn points despawned sometimes without notifications and i couldn't find the system behind it)
Also add something like a black outline to the menu text so you can still see it in the second level.
Although - Great game that just needs some polishing
[and an easy mode :-( ]