Thanks for your opinion! Currently I'm not working on the game (break because of GitHub Game Off), but I'll take your suggestions into account. I'm not sure about what kind of visual feedback I should implement for the Spamality meter and the health bar, I also don't want to implement any tutorials, as I believe this would go against the retro theming.
The game was made in 2 days, I didn't have enough time for music :/
Again, thank you for your feedback!