Good to see some timelapse stuff happening on Steemit. I have tons of tips for you if need.

It's quite hard to see from these videos what you wanted to achieve, so it's a bit hard to give comments.

Which settings did you use? There seems to be some seconds of pure black in the end, did you do any exposure control or editing?

Davinci Resolve is for free now and you can import canon raw directly, so that pretty good for serious timelapses. You can do all the color grading and editing you would ever need.

Also qDSLR dashboard is an amazing free program for capturing timelapse that let's you control and monitor the exposure during the shoot.

I've used both a lot and they can really bring up your stuff to a decent level very quickly.