When i try to play it and start walk in one direction and then stop, i can't look in the other direction. Nothing is wrong with my mouse, i works fine outside of the game.

I am having the same issue.

I suggest using a controller for a ps4 or xbox if you have one, the mouse is just buggy atm

I'm so sorry guys :( this is fixed in the Steam version along with a bunch of other things: https://store.steampowered.com/app/1531010/Collisus/
Hit me up on discord and I'll give you a steamkey https://discord.gg/weRMJf99yp
- GameDevDave