It’s cool that you are doing this, meaningful comments are da bomb yo!
In all seriousness yes, engagement is key in things feeling like a community so keep up the good work.
Sometimes you do have to keep the comments short but all in all, it should say something about what the Steemian is trying to do. In this case it’s pretty straight forward, it’s like: good job. But sometimes authors will really make you think with their topics and it enriches everybody’s lives.