Great fun!
Visually the game looked great, and was a lot of fun to play.
It's a little weird having the audio off by default – initially I thought there was no audio, until I went into the options. I would have the audio on by default.
Gameplay was great – only thing I probably would have changed was either up the amount of enemies that appear over time, or have a lot fewer shield powerups – it was fairly easy to not die in this game because there's a lot of powerups always available.
Super great work though, it's a very complete feeling game!