Banyana drew their Group H opener 0-0 with Slovakia on Wednesday in Ellis's first assignment since taking charge of the national women's side on a full-time basis last week.
Ellis acknowledged it was a case of two points dropped but felt strides have been made since their 3-0 friendly thumping by Sweden in Cape Town in January.
"Overall defensively, if you look at the Sweden game, we worked a lot on structure and I felt we did well in that department," said the former Banyana skipper.
"Our offensive play, especially the one-on-ones with the keeper left me with a bad taste in my mouth. We keep talking about missing chances, we hit the post in the first half as well. But the positives we can take out of it is that we were solid all round."
She added: "I think it was points dropped. Except for the first few nervous minutes, otherwise we controlled it very well. Also the decision making in the final third; if we had gone left instead of right at certain times we'd have been in a better position.
"The final ball was also poor at times. But on the other hand the performance overall shows we have progressed as a group where the Sweden game was concerned.'
Ellis was impressed with the performance of debutant Kgaelebane Mohlakoana, who replaced Leandra Smeda after the break and could be due a start tomorrow.
"Well there were a lot of players that came in and raised their hands seriously. A couple of players didn't perform that well, so we will have to sit down and look at the big mix.
"Obviously we have to look at the oppponents and see what their strong points are, and how we can overcome them and use that to our advantage sitting down and analysing.
"But definitely 'Bana' has raise her hand, she was excellent on debut and it would have all come together if she had scored that goal, but what a great save from the goalkeeper. But she looked busy; one-twos. For me it was like she was watching the game and was seeing how could I affect it in a positive way and that's exactly what she did."
The 54-year-old Ellis has been tasked with steering Banyana to the African Nations Cup, the World Cup and the Olympics.