This game is incredible. Fresh and truly unique. Beautiful theme and colourful graphics make it really relaxing. Great job! One thing to consider during development is the difficulty curve. Tier I is most difficult, and then II and especially III is a formality - hard to mess up. Secondly, once I mastered tier I in the first and second map, all other maps proven to be easy. The first 2 maps I had to restart many times, second two - did it first go. The last one will most likely be similar. The game needs something to flatten the difficulty spike at the beginning and provide extra challenge in the end game. My gut feeling would be providing more undo levels, and adding more complexity to tier II and III requirements.
Tier 1 has this "do it right or die" situation. One misplaced river or calcifier and you run out of money. You have some, but not nearly enough to correct your mistake, and a single undo does you no good. You are stuck and need to restart. Before you learn to be efficient you fail several times. On the other hand, once you literally lay the ground work and cover a decent chunk of the land with reclaimed area it is cash out time. You can start with placing bee hives for a big chunk of money for example. You also get the lab, that enables cheap tools to fix small issues. At tier 3 you are even less locked in because you get the ability to recycle buildings... and so on. :) The game gets more forgiving the later it gets so I guess it is "hard to learn easy to master" :D Anyway it is great fun and thank you again for creating it. Pledged 5$ :)