Do like! Not only a nice time waster but a good strategy puzzle. Sounds are good enough (I didn't feel I'd have to mute).
I think it takes too long to upgrade, but that's just me.
Neither did the medals unlock with or w/o ad-blocker, nor on a completely different machine w/o ad block even installed. I hope it's some bug that can be fixed from your side.
Anyways: Good game! I guess I'll finish it eventually, with or w/o medals.