This was really fun! I really liked how it's this combination of high stress and contemplation as you wait to build up funds; it really had good tension in the later levels watching the "line" of eggs moving down as the cannons struggled to catch up until I was able to upgrade.
I think some small things to improve the feel would be to have some clouds in the background and to lerp the camera position instead of jumping to feel the height change. I hope you keep working on this, I'd love to see more!