Thanks for the kind words and also the feedback!
I believe if you find the itch fullscreen button in the bottom right corner the resolution should adjust to your screen. The way the game should work is after you've moved your troop it gets you to spawn a new one or place a wall to continue the tutorial (after you've moved the troop it detects when money has gone down) then you can unpause and combat will start and the tutorial is basically done. In retrospect there should have definitely been a way to skip the tutorial...
As a side note i played your game after seeing your comment and had a lot of fun, I especially thought the character sprite was adorable! Im glad i found it :)