Overall, you did a great job.
For rewatching value, it would be good to have timestamps or links to certain topics in the video. For example, I will forgot some of the shortcuts for moving and aligning selected objects.
For the mouse clicks and audio, did you record the audio using your laptop microphone? If yes, just use a handset and turn down the volume of the mic. If you were using a handset or headphone mic, either turn down the volume of the mic or use a mic foam.
For long pauses without audio or to cancel out background noise, consider playing a background music track or loop of songs that have a pace you like. This is often used in commentary tracks and the music is basically only audible or recognized by listener when you do not talk for like 5 seconds.
For improving the webinar, leave about 20 minutes at the end for Q&A (5-10 minute break to think about questions and the rest for answering questions). This can often help with planning additional material or the coursework for the next webinar.