Game is fun BUT:
-Classic indie Chinese developer problem: the text is machine translated, not translated at all, or directly missing. Unacceptable.
-The game loop is decent but the grind is seemingly random for non basic currency, which extends it quite a lot.
-Most items are simple % increases to damage, speed etc.
-As the game goes on the enemies get bulkier and bulkier and the required enemy amount to kill increases, making it a slog after the second or third boss.
-In the second half of the run you have to blindly find the correct levels to complete among a lot of them until you win enough to make the final boss appear. It's just a waste of time and adds nothing.

TLDR: It's fun for a while but needs more patches (that are not coming, ever). Buy greatly discounted.

Game has been abandoned. The English translation is unfinished as well.