Thank you for playing and for your feedback, @aFoolsDuty! I can only imagine what went wrong on the placement but I suppose it’s either because there was already a tower (which should then be marked in red on screen), or you didn’t have enough coins.
Probably the latter as I didn’t make it obvious how much each tower costs to not clutter the UI too much. There’s probably an elegant solution to that too though. I just didn’t came up with one :) Again, thank you!