Ignore the haters - you gave a good, clean read on a film that benefited too much from the low oxygen levels at Sundance, and the appealing backstory of This Year's Model.
Film is an ambitious but underpowered stab as blending a kosmic Horton Hears a Who trip with redemption melodrama... just as you describe.
Note to admirers of the film: maybe watch some Tarkovsky or Kieslowski? But ease into it...
BTW: is it just me, or does "Primer" look more under-rated each year?