Fans of the Touhou Project will feel at home with this one. Many of the core concepts are here. You have a variety of shot types to unleash carnage. Some of the shot types are gimmicky which might be able to be taken advantage of by a skilled player. There's a variety of fun puzzle-like patterns to dodge and there's a satisfying feeling to learning the patterns and progressively getting better.
However I find that the patterns are a little too simple. I didn't see any that had the intricacy or beauty of some of the Touhou patterns. There's a lot of patterns that are just bullets fired at a straight projectory with a changing starting angle, or just a ring of bullets, or just bullets fired straight at the player. I'm not sure if there was a single pattern I was like "Wow, how was that generated!?". There's also some gimmicky patterns like the square of bullets that breaks down when it hits the floor that you see in the example gif. I can't decide if that's a good thing or a bad thing. Also you can get through the second half of stage 2 on normal difficulty by standing still which is not good game design.
The bosses need to have health bars. Without health bars you cannot gauge your progress or get a feel of how more damage higher damaging shot types do. There should be a level select option too.
The graphics harken back to early doujin games where the artwork was cute and dare I say "soulful" but far from professional. One of my gripes with the graphics is that the bullets don't really pop out from the background which makes them hard to see when dodging them. Furthermore, there's this one pattern with the stage 2 boss where snow is used to indicate the direction of the wind but I thought they were bullets at first and tried to dodge the snow. Also many of the enemies are just circles which is just uninspired. I do enjoy looking at this game nevertheless.
As for glitches the game crashed on me a couple of times and I think it was always at the stage 2 boss. I don't know if this is a problem with my PC or the game though. I also fiddled around with the options menu and somehow I had it where the graphics were all shifted to the left making the right side of my screen a black void.
At the time of writting this I made it part of the way through the stage 3 boss on normal difficulty. If I progress further I might edit this comment. I have many more demos to play through and give feedback on.
Overall, I enjoyed myself with this game. If you're looking to scratch your bullet hell or Touhou itch - this will do it.