I really like the game's music and how it's integrated, this is outstanding! The gameplay at first is really satisfying, because of the economic growth and once it gets a little boring to stare, you notice the music kinda reacts to what is happening! That makes it really relaxing to look at. I agree, though, that there should be more interactivity in times of waiting between upgrades. I also had a few technical issues.
I had game freeze a second on a completed branch, that's not a big deal at all. I also had a bug (or a feature) that ants cost has REDUCED once it got over a 1'000'000. The most unfortunate bug is that the ants are just got stuck in the branch at the endgame (I was in 4 branches from completion). Funny though, I actually found how to get around this by switching in and out the game page, but they get stuck quickly again and at some point it stopped working.
Anyway, I was glad to put my time into playing this! Nice job!