i want to speedrun other games and i dont know any i should speedrun any recomendations only pc games?

I would recommend there is no game.
That game is 5 minutes.
You don't have to download it, And is easy!

since you are finnish ill recommend the Muumit series of games ;)
rally trophy is a cool racing simulator
dukenukem (the old 2d platformer) is a nice and short one
cave story is one of the best 2d platformers i know and the original release is free

Depends what you are looking for, web games, steam game / short or long ect. Though i would suggest : 
Superliminal
There Is No Game
This Call May Be Recorded
Tetris (Web)
Cluster truck

i think short probably mostly web games but some steam games also

Factory512 ?
It's a challenging platformer

Good games to speedrun?

SioN