Thanks for sharing! Yeah, I think you've really hit all the important beats with this cover. I love the little detail of using yellowish-orange since that is a dominant color in indie comedies (in color psychology, yellow signals happiness, excitement, friendliness and optimism). I also love the logo! So I'm noticing that the boy on the right (blue hair) is taking a dominant position here. He takes up most of the space, is leaning toward the other boy and looking down on him. If this is intentional, that's great. If not, you can do something to the composition to make them seem more equal (use symmetry to create balance).
It's a great cover, but if you really want to elevate it, think of ways to make your figures consume the space more. This basically means: how can you use pose, expression, action, composition, and depth to make your figures take up more space on the cover? This is important for covers that have a simple background and rely on positive space, and it does a lot of good things: (1) It cuts down on negative space, making your main subjects stand out more, (2) it makes the overall composition more visually interesting and (3) It also makes your figures feel grounded. "Grounding a figure" means to make your figure seem like they're taking up actual three-dimensional space, and is not just a flat drawing. For instance, if you showed the characters legs extending off of the canvas, I think that alone would improve the composition. Right now, they are floating in space. While this technique can work in some designs, I think in your case, you should draw their bodies extending off of the cover.
Also, it would be a great idea to add a little perspective! Perhaps we should be looking up at the figures, since their poses/actions imply that they are performing on stage. That would add a lot of visual interest.
Lastly, I Googled "Jem and the Holograms comics" as a point of reference for this critique. You should check them out, they're really well done, great examples of figures consuming a space with a very simple, yet appealing background.