I really like it
And dont listen to those who thinks its pay to win; its totally understandable you included some options for you to earn back the time you spent on this.
its really simple; but building stuff always makes people happy (minecraft, factorio; from the depths; etc, sure those games are more than just building; but the building element of it is so much fun!)
Continue developing games! would love to see some building game of yours with enemies (Red alert ala Baldurans?)