Nice game! The artwork is really great, there's a lot of nice little details like the scrolling background, screen-shake, and different enemy types. Shooting the goblins with the machine gun is very satisfying!
I do wish it communicated with the player a bit more e.g have some on-screen text that tells you the backstory, tells when an enemy wave is completed and tells you your goal - I enjoyed the gameplay but wasn't always sure what I was doing or why. Its unfortunate that there was no music as that would have really helped to tie it all together. A very good entry overall!