I assume that since there hasn't been a meaningful update in over a year that this game is being left to make what little money it can before eventually being shut down, but in the hope that it isn't, I'd like to raise the issue that several others already have in that players are now rampantly taking advantage of a bug with Samanosuke whereby his first heavy-sword ability can do absurd damage instantly, with no charge-up as was intended. It looks to be due to a race condition where the basic attack button can be pressed for one frame after the ability has been activated, but before those buttons have been disabled and the cooldown timer starts. Searching for "samanosuke bug" on YouTube provides evidence like this:

https://youtu.be/-xVFHiPfPSc
https://youtu.be/P53xk_6znJU

The balance of the game is fairly good aside from this issue, but it's being abused so widely now that the quality of play is significantly impacted.