Good, but very easy, especially when you discover you can hold down the shoot key. The firing speed increase is either very common or persists forever, making it even easier. The text has some antialiasing on it, breaking the 5 colors rule. The score and high score are both displayed as NaN in the game over screen, but this is minor.
Thank you for your feedback. I know that there are many issues with the game's design and visuals. I didn't give the game enough time for play testing, and I had to leave the game's text blurry due to my frustrations with using an obscure engine (ct.js) while the deadline was approaching. And one more issue I encountered is that after the export, the music doesn't loop after the song finishes.
All of these issues will be fixed in a post-jam version of the game.