The tutorial explains the game mechanics well, but I found the aircraft controllers too complicated (maybe there are other similar games with these controllers that I never played and that is why I found it so hard). For me, part of the fun of a bullet hell is about dodging a ton of bullets, and usually the controls are simpler to allow the player to master this precision, and also the bullets are more predictable. Something I liked about the game was how different the two ships play.
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Thanks for the feedback. Yeah I was pretty confident about the controls but after getting many people to complain about it I reworked the tutorial to split the controls in multiple more digestible phases, doing so I added a phase where you are frozen in the air and just have to align with some markers. Trying it myself I realized it was actually not that simple to align precisely and I realized the controls real issue is this inaccuracy that I had become actually very good at countering over time playing the game.
So I improved the turning system so that it allows for accurate controls and fast turns and fast stops which made the aircraft much more accurate. Update soon TM. (it's been 3 days I'm saying it's going to be live today or tomorrow xD)