First off a really well polished game artistically and the audio accompanied the aesthetic well, the UI for the most part was very intuitive and made it easy to pick up and understand which is a sign of good dev work. A strong concept as well playing as goblins against invading heroes which was a good and original take on the theme. In terms of constructive criticism i found the increasing of the unit prices a little steep and maybe not necessary to such an extent as it meant you are never really saving up much towards your goal, I also think the game could have benefitted from some health bars or some way of seeing the damage received and given to both your goblins and the heroes. Aside from that I think this is a super strong submission!
If you got the time please check out our game too and let us know what you think!