This game's demo is hard to pinpoint for me. It objectively tells me that it's good, like the visuals and stage design, but it feels... underwhelming... And I don't even have any expectations.
You can shoot, focus shot, skill and bomb. What is this skill, you ask? It's a bullet-clearing shot that can be refilled. There is only 1 stock available for it. So this game is more or less uses Giga Wing formula. And I like Giga Wing!
It's well-paced, not repetitive, and well-varied. Bullet visibility is good and the patterns are nice. HP calibration is also good. But maybe it lacks things to shoot? Maybe the gimmick doesn't feel that fresh? Or maybe it lacks velocity, which makes it feel rather slow? Slower than Touhou? Maybe because it doesn't feel that intense compared to Giga Wing which is very aware of its bullet-clearer nature? Or the skill charge doesn't feel compatible to what the game is aiming? It's hard to provide constructive feedback here.
One thing for sure, the music isn't good. Feels very generic and lacks energy. Also overall it's entertaining enough? Try the demo. It's not a bad demo, at least.