Given I have not played many bullet hells, still if I had to guess this would be one of the harder ones. At some critical stages, there are no further upgrades, so either git gud or die. A bit of luck is also involved with the enemy movement and/or projectile patterns. But overcoming them is such a satisfying feeling, to me it was worth the frustration. Because the game never felt unfair, just my skill issue.

At the price, its definitely worth picking up. I enjoyed my few hours finishing the game. I can see myself coming back to it sometime again in the future as well, given its so short. But not masochistic enough to try permadeath.