It's great and pretty challenging game!
I don't know the difficulty curve but I felt the first boss, maybe it's not the boss as I'm fine with it has lot of HP whatsoever but it's minions was actually bugging me, the second was much easier, Idk if I missed it but I was expecting spinning attack because we play as a beyblade(or that what I call these things) especially against those minions, it would be felt great if we could just slice them all up with spinning attack sort of.
I also had a bit of trouble with camera or maybe I just don't know how to control it because it's felt a bit too zoomed, I know this's pretty much a fps but I sometimes overlooked the red AoE on the ground when I was aiming at the boss.
My antivirus actually quarantined your game, not because it has virus or anything, it's always happened when I download exe file so just a suggestion that you zip or rar the game file just in case someone clueless reports your game being virus, just saying.
That's all I guess? well if I said something wrong or missed something, let me know.