There is indeed a delay before you can send troops again, we didn't have enough time to implement an indicator for when you can send more troops.
Good to see my AI is actually challenging, this was my first time making one.
If I had the time and skills required to make music, I would have. Sadly I had neither.
Thanks for the feedback.
Websites like filmmusic.io or soundimage.org have a decent selection of music you can choose from that are often used in jam games. It can look a little iffy if you're using the same music as someone else, but there's several hundred songs, so you can probably find something fairly unique and that fits your games.
Both websites run under Creative Commons Attribution, so you're free to use the music commercially or non-commercially, as long as you credit the creator how they request.
