Nice concept, it has potential to be great game, can even be converted to roguelike (by adding more blocks to purchase and purchased block can appear at level at random)
I noticed it was quite easy to cheese points in first few levels, but it did get tougher as level progressed, one more noticed, scores get carried over to next level, so that means, if you scored extremely high in earlier levels, you easily get passed to next few levels. I don't know if it was intentional or not, but making score start from zero each level would have been challenging.
Also, I noticed when collecting points timer goes fast but other actions timer takes slow, if it would have been other way round, it would have lot more fun, since collecting points were too slow, player would have been forced to think of ways to stop erosion, before they can collect points. Right now since collecting points was fast enough, I just kept focusing on one block only lol.
It would have been nice, to know how each block impacts next block.
Great game which has potential to grow big.