The creator himself! :)

Gaurav, firstly I'd like to emphasize that the videos are pretty good. It is just extremely tough to do polished videos on algorithms because of the number of different criteria one needs to satisfy.

The two main elements I found lacking as a person curating video tutorials are the following

Often in the script, it feels like you are lost for words, or have to revise what you said in the previous sentence. I don't know how many times you practice a script before recording it, but I think its difficult to do this in a single take for the tougher concepts you're trying to explain. Recording each 30 second - 1 minute section separately multiple times and stitching them together would make it much much better.
The tools you're using, namely speech and whiteboard, are fairly limited in a lot of scenarios. There are lots of things that are important that you won't write down because it takes too long to write and feels unnatural, and same regarding drawing. Being able to animate, or add a sentence in the video using video editing tools while highlighting the important parts would make things better for the viewer.

Again, both the above have a learning curve and also imply a significant increase in the time taken to create a single video. As an example of a top-notch video, have a look at the Segment Trees tutorial.