First of all I love it. Love the colors. Now for some constructive criticism.
You are missing some details on your buildings.
What I mean is that the details on the buildings don't match the amount of details you put on your tittle. It looks like your buildings are sketches compared to the tittle.
Besides that you might want to add krambot to the cover and an alien ship closer about to attack/abduct kram-bot.
Your cover feels empty compared to the tittle.
The tittle gives me so many details about the story but the cover just shows me aliens attacking buildings.
I love the tittle and the colors but I don't love so much how empty it feels below the tittle. Don't know if you understand what I mean?
Another option is to add kram-bot below the tittle running from alien ships instead of a city being attacked.
A third option is to make your cover feel less empty is moving your buildings and aliens a bit up in your cover.
And then add the ground with more details of a city (streets). That way the cover will fill less emtpy and you can even add a Kram-bot looking back on the city instead of being attacked. Basically kram bot is observing the situation.
That is my opinion on how to improve your cover without removing the essence it gives the reader.
P.S. if you are missing space you might want to consider reducing the size of the tittle by a tiny bit as it does consume lots of space. You can even move it a bit up but idk how that would look I honestly like it as it is. But when you add details go a cover you have to adjust the size and place of the tittle accordingly.