This was a really cool puzzle mechanic you thought of! I would love to see it implemented in different ways. You could create smaller levels with some established tiles already and have X turns to generate X money, or reach X generation in one turn, or convert all tiles from desert to forest, etc. The list of puzzle possibilities are endless!
It could use some sound effects and some relaxing music, but that's a given! Great job for 48 hours! You should definitely consider polishing it up after the jam!