So, I think you should stay away from the VH during plays like @ 50 seconds. I think a butterfly or a reverseVH would be better here. Since you said you are relatively new to goal tending I'd focus strictly on being square in plays like that. Personally I'd say just be in a square butterfly and that should do the trick, it'll keep you more mobile and make it easier to control the rebound. I can tell you when I play against starting goalies and they go into the VH I get happy as they always give me some net to shoot at. I can't tell if this is the case here because of the camera angle, but I'd suggest against using the VH for most starting goalies.
At 55 seconds make sure you are square to the shooter, I think you should be challenging more here as well but I can't be sure again because of the camera angle. I understand you are worried about the person back door, but you have to ensure you are square to the shooter and not cheating, you are pretty good at sliding so your abilities will be able to cover the backdoor fairly easily. Also, when playing a lower level of skill I feel you can give up those passes a bit, since the chances of the players making a good pass and then getting a good shot off are pretty small. Since defensive coverage in rec is spotty to begin with, it gets worse in lower levels (understandably), if I find myself in 3-on-1/0 or 2-on-1/0 situations I'll just play the shot, since the pass requires 2 players to make decent plays just to get a shot off.
You also favour your left leg a lot, what I mean by that is when in the butterfly your left leg sticks out while your right is directly behind you (see 1:12). Now I understand why you did it, since you pushed from the left to right and it naturally happens, but it does leave gaps and I think the players ended up shooting towards your right leg where those gaps occur. I have had issues with this the last few years and basically cheat to one side, and it is something I have been trying to fix. Ideally you'd just be square in the butterfly and have fast enough legs to cover the far corners, it is just something to look out for as it can get you into trouble (it certainly has for me).