I (MJK) played about 20 times without getting past round 4 before I figured out the one strategy of just spamming diamonds in a line, with squares in the front. Then I got to round 30. Then every level was the same, and I decided to stop buying anything to see how long I lasted. I lasted seven more rounds without placing anything. Then the leaderboard broke and it kept asking me to enter my initials. I'm proud to say I got the frame rate down to 2 fps.
Solid game. You managed to capture my attention for more than 30 minutes. The scaling needs a lot of work, and the other items and strategies need balancing. You can only sell a triple diamond for the price of a single diamond, so it is never worth it to place more than one. You can't sell the boomerangs, so that isn't worth placing either. I really like the minamalist art style, and the music is a bop. Overall good game.