For those who have trouble defeating the boss of the gym. Avoid wasting your pistol ammo; try to get to the boss with all the cartridges, plus the extra ammo you will receive, you should have at least nine cartridges.
It took me three tries to get through the level, until it occurred to me to save all the ammo and that's when it worked for me, but I almost ran out of ammo after I got out of there.
Otherwise, the game does have some noticeable bugs, such as Syahata standing still at times (this happened to me with the gym boss). There's also the joystick, which is a bit more difficult to use.
Taking out the bugs that you still have, I have to say that you've excelled yourself, Jashinn. I know you can keep improving, cheers.