While I haven't completed Super Killer Hornet, I think I can safely say that this is certainly a "different" game compared to most.
The bullet-hell genre is one that I am not a huge fan of, but I gave this ago, and yes, I still suck at Bullet-hell games, but my god do I also suck at math. Throughout the stages you "pick-up" different numbers. My first "1+" the next...."10". That's easy, 11. You fly through the number 11, you get a bigger and better gun! Oh awesome! As you get further and further into the level, the questions become a little harder and the multiple choice answers appear much quicker. You better know your times table up to 13 off by heart because otherwise you are in for a bumpy ride.
To me this screams out as a learning aid for children, but whether parents or teachers would want the kids to be playing a game so heavily involving shooting stuff as being suitable, I don't know.
There is multiple different game modes, Arcade, time attack as well as in game awards. Sadly these aren't linked to Steam achievements though. Another downfall is there is no options at all here. You are stuck with the poor resolution which is stretched terribly when you enter full screen, the music is horribly repetitive after the first 5 or 6 plays and you'll probably end up turning the music off all together to be honest.
For the price, I'd recommend it, some real classic bullet hell action with the added twist of math!