It's a free app with no mandatory ads where you can have a satisfying bullet hell experience in 10-30 minutes. Decent handful of stages, lots of characters and weapons, and some great secret content that I recommend using the wiki for. Not sure why you would dislike or be angry about something like this, lol.

I don't mean to rant, but looking at the top reviews, I'm reminded once again that the community on this site is consistently try hard and contrarian about every single game that gets any amount of attention. I've spent lots of time on sites like this, RYM, Letterboxd, etc. and this one has the most annoyingly negative userbase by far. Don't take yourselves so seriously, it's extremely fucking lame