I like the explosions that the bullets make. Neat animation. It's funny the way you can extend your neck, and I really enjoyed wobbling it back and forth as I ran around. (Does it do anything, gameplay-wise, though?)
I didn't realize you could enter holes until I had beaten like four screens, ha.. I thought they were just stage obstacles since my bullets seemed to hit them also. So I had to double back around to the holes I had passed. Problem is... I got really lost playing this game! Every screen looked pretty similar, and I also wasn't really a fan of the way you could go to the top exit of a screen and then suddenly be at the side of another screen. I would prefer it to be 1:1. So, like, top to bottom, left to right, etc. I think that would help my sense of direction.
But my journey ultimately came to an end when I went to go take notes about the game and pressed escape on my keyboard, resetting the game. Oof. Maybe a warning would be good "Are you sure you want to reset?"