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.

Greetings Mineral Defenders!

Got some more small additions, fixes and changes:

Added:
- Added "Sustain" options on towers. When set as enabled, a tower will sustain its target until that target dies or goes out of range. This is different to the default behavior where a tower will constantly search for the best target based on its target preference.
- Holding Ctrl+Shift when placing a structure will upgrade it to the level you can afford.
- Added a separating plus symbol between tooltip images where those tooltips are a key combination
- Added a "Show all range" key (Default R), when held it will show the range of all towers.
- Added a popup confirmation box when starting a new game while a current game is in progress.

Fixed:
- Actually increased the max damage and range of the bomb tower
- The Taser no longer uses the Railgun sound effect
- Fixed some structures being invisible when multi placing them
- Fixed not being able to deselect the ability menu with the ability menu hotkey after selecting it
- Fixed the range indicator staying around on some structures after selling them

Changed:
- Electric tower now attacks only 2 enemies at a time but does more damage. This change is intended to make it more useful on individual shielded enemies rather than only being good at groups of shielded enemies.
- Removed the upbeat upgrade and supply cache music, replacing it with a low pass filtered version of the wave/boss music. I feel this fits in better with the theme of the game.