Thank you for playing! Since I was the only playtester, I'm sure balance isn't ideal. This jam confirmed for me that balancing games are really hard. I felt that making game a little easier would be better for the jam, since it takes time to beat. And I think making game feels unfair is worse that easy. Glad you enjoyed it!
Yeahh, perfecting the balancing of a tower defense game with 30 waves (on top of building it too!) within a week is definitely a challenge.
I agree, as it's a jam people probably wouldn't take the time to persist if it was too challenging, meaning they'd miss out on experiencing everything else the game has to offer. Good call!