I've been playing for a while. After about 10 attempts, I didn't reach the first portal. The process of the game in your video is something unreal.
Thanks! I was able to make some progress.
Attempts at slow movement were unsuccessful. This was my original tactic, so it is not surprising that new attempts failed. But when I tried to do the opposite, the result was better. Actually, this is the style from your video. The difference was that I didn't have the agility to hit at least a quarter of the enemies.