Difficulty was one of the hardest things for me to get right while playtesting. pretty much the entirety of day 4 was spent trying to balance the difficulty, and I don't think I ever quite got it right. The game was too hard for most of the people I playtested on, so I made it easier in various ways, like making enemy bullets move slower, increasing player health, and things like that. Eventually one of the changes that I made was to make the player's rotation more snappy and less inertial, but after that the next (and final) person I playtested on won on their first try. So after that playtest I nerfed the player's health again to try to compensate for the easier controls, but I may have overdone it.