I like the plot, your utilization of the space, the costumes (garters), the succession of movements, the atmosphere, the rhythmical realization. I don´t like your stepping at 1:25 - 1:26 You are leaning backwards, that´s a cardinal aesthetical sin. By the way it´s a choreo, not an improvisation. Improvisation is when you do not know what will come. May I ask if you are planning a second act with more lyrical dancing?
I assume the vid show a school staging Euro/American tango clichés for an audience of parents and friends using only a limited budget and amount of time. In this regard everybody did a fine job.
You might want to improve to portion of tango and stage craft in this performance.
For a start everybody might want to learn to walk and stand with purpose. The transitions of the leading couple should become smooth the poses pronounced and actually dancing a few of steps might help as well.
How about dressing the main characters in vibrant colors and the background dancer in dark ones? A moving spot will gather the focus on the action, the moving emblems on the backdrop are a distraction.
Get rid of costumes with the look of cheap materials. Pantyhose’s pretending to be a garter belt are a No-Go and won’t be seen in the back anyway. A flowing wide gown is not helpful to underline the rather abrupt movement of the lady’s leg in tango. Check the usual suspects for a better model (Tango Passion, Senor Tango, Rojas, Montes, TV dance shows)
Revealing the lady’s leg on occasions in a controlled way will result in a more erotic tension than flashing it by accident. Running along the whole stage to gather momentum for a waits high jump is strictly reserved for comedy moments. (Although I doubt anybody else has noticed that.)
There are plenty of cool show elements: smacking her around, jumping on and kicking of chairs, etc. Why not gather them in one easy to follow plot culminating in one final conclusion?
Leaving that nitbits aside, I felt entertained and therfore liked it - despite the song.