First of all I would say that your banner is nice but simple, maybe it needs your love! How abt make a new one?
Make sure you work on your thumbnails

Your audio quality is nice

The way you handle the camera is pretty cool

The video is interesting, but you can make it more entertaining by focusing more on the FUN you guys had rather than talking abt random stuffs

Audience will be more interested if u show interesting things in the video

I like your FREEZING water part, I can feel myself in the video haha!