Digging for gems

Secret game made for the fourth BGMQ game jam - cause an earthquake to get gems from the earth*, but dodge the evil purple** ones because they're dangerous***!!! WASD controls.

*I think this is how that works. Gems are underground

**I'm red/green colourblind I think it's purple

***If you allow yourself to think this premise isn't stupid then you'll enjoy it. Simple as that. Okay?