Polyomino Prospector

You're a miner, employed by a company who provides you with some mysteriously-shaped digging machines.  How deep can you dig?  How much money can you make?  How much can you spend on increasing your repertoire of digging machines?

You are tasked with positioning polyominoes as they move down the screen.  Rather than fill up rows (the usual fare for such shapes), the pieces excavate the area in which they are placed.  Mine for coal, gold, and diamonds, while avoiding rocks.  Visit the shop, buy bigger and better machines, put them in your deck, draw them, use them, profit.

It's not all playing with excavation though, this company needs results - results that can only be measured by digging deeper and deeper.  There are limits on how many pieces of equipment you are allowed to use, and if you exceed the limit, the dig is over.  Luckily, you get a generous top-up the further down you dig.

Controls:

• Move piece - Arrow keys
• Rotate piece - Up arrow, and Z and X
• Pause/Menu - Space
• Navigate shop - Arrow keys
• Make purchase - Enter/Return

Piece tiles:

•  Bomb - Explodes rocks (good) and valuable resources (bad).
• Nuke - A bigger and better bomb (and more expensive).
• Diamond Drill - Cuts through rock in a controlled manner.
• Gold Pick - Triples resource yield (that means profits).
• Vortex - Creates a swirling vortex.  If a piece touches this it will be trashed (removed from your deck).