I want to save the game but don't know how

i know it’s say unsupported but anyone have any luck?

Select keyboard and modify the keys to A=Z(jump) , B=C(punch) , X=X(sword swing) , Y=D(charged punch) , R1=S(powerup change) and you can use the joystick by modifying thr keys to the arrow keys on keyboard. screen size is tiny and not adjustable but its the similar size to a gameboy advance so its not bad. F2 key is supposed to open settings to change difficulty and sound stuff, and it freezes the game visuals upon resuming, on steam deck so dont use it. This game uses password system so there is no need ...

...... :D

Is there any chance of getting achievements enabled on this? A lot of older games have started enabling achievements on steam recently.