I really get into this, I couldn't stop playing haha! Truly a Dark souls experience ;) Jokes aside this is really good actually. I love the simplicity of it and it's really fun. I love the mechanic that you only get one bullet and the enemies build up over time. Also shooting the laser to clear out the blue skulls is pretty clever and really fun to try and get the perfect shot to take out a few at a time.
I would love to see this expanded and add bosses and what not. You have a really nice game here and the visuals are cool too!
I couldn't hear any sounds though?