I didn't think it was that hard to get,

Matarika (main protagonist) you have to have a creative open mind to really get it.
Forget the past= Matarika must forget his past (meaning something happened a long time ago that was traumatic) (the video shows matarika in an a normal fight, but at the end theres a memory thing going on in the freeze frame)

Remember the future- Matarika has accepted his past (or has he?) his past lingers as he prepares to enter a tournament with professional fighters and parkourists. At the end despite his past is still lingering, he refuses to let it stop him from winning. (nothing, will, stop, me)

It'll become more and more clear throughout the plot, i've tried to make it more understandable in this video, but i hope it doesn't make it more confusing.