Hi Mineral Defenders!
This is another small patch. The changes are as follows:

Added:
- Added drillable minerals scaling. Income from mineral deposits will increase by 2.5% per wave.
- Added optimizations for muzzle and impact particle effects
- Added optimizations for projectiles
- Added optimizations for range indicators (Pressing R to view all tower ranges should no longer lag)
- Added a "Skip Loading" button on the "Loading Steam Stats" page that will appear after 5 seconds.

Changed:
- Structures can be sold for 100% refund if sold on the same wave it was constructed on.
- The "Loading Steam Stats" page is now much faster to finish loading.

Fixed:
- Electric tower description now correctly states that it attacks "2" enemies instead of "8".
- Fixed the sustain condition not saving/loading correctly with the player-override default tower settings.
- Fixed AOE towers (Slow, Electric) not respecting sustain conditions.