Layman,
you don’t really outline your purpose for this particular sequence/practice. I understand it’s physical but beyond that I would be making massive assumptions.
Intention aside, I’ll comment on what you have shared.
I don’t begin a practice with Savasana. It is a pose used for bringing the central nervous system into a parasympathetic state. Ergo it is used at the end of a practice to calm the systems before returning to the real, and slightly jarring outer world.
Because this is the nature of Savasana, two minutes would not be sufficient. Five to 8 minutes would be a minimum. But of course if you like it and it works for you…
When I teach/practice I use the first minutes of that practice to ready the body for the asana to come. Navasana is not a posture I would begin any practice with as it places immediate and significant demand on the hip flexors, a part of the body in most people which is chronically tight and short. It also therefore sacrifices well being in the sacrum and lumbar spine.
I don’t know what medu dandasana is. Dandasana is a sound pose for an opening but it is not, in and of itself a complete (or even partial) opening.
Then you move into Bhujangasana (a beginning back bend). And this is without any inversion of the spinal column whatsoever. Generally speaking, backbends and twists follow inversions so that the spine may release for such poses. Perhaps Sirsasana is “not your bag” but adho mukha svanasana may be. Salabhasana is a back strengthener not a back bend, and then Ustrasana, which is a backbend is somewhere else in your sequence. Puzzling why another backbend would not be with it’s brethren. But it can be so however it needs to be correlated to purpose. Additionally, twists follow backbends, they do not come before them (in a practice which emphasizes safety).
Viparita Karani is a calming pose and that is best set just before savasana rather than before Sarvangasana. And after the neck opening in sarvangasana we do not bear weight on the head is it is risky for the cervical spine. So as long as you are not resting weight in “fish pose” then it is ok, though we do not do it as a regular part of a sequencing.
I’m winded.