Here is a little update, v0.21. It adds a few options, some fixes and minor improvements, and more important: a few new achievements. And all of them should be quite challenging, so good luck!
For my part I'll be out in vacation for the two next weeks ; then I'll be back to work on a few minor updates like this one, before starting the big work of multiplayer.

v0.21 Change Log (Build 271)

GENERAL:
- 20 items slot in bar, right ones with shift+1/2/3 shorcuts (bindable). Items bar centered.
- Add achievement "Crystal Multiplication" : Generate new Black Crystals
- Add achievement "Amish Paradise" : Finish the game without producing any electricity in Hard or Brutal difficulty.
- Add achievement "Run Forest, Run!" : Survive the first night without shooting nor crafting anything, in Hard or Brutal difficulty
- Add achievement "Action Man" : Survive the first night without crafting anything, in Brutal difficulty
- Add achievement "Early Dive" : Reach the underground ocean and go back to the surface, without crafting Auto-Builder MK2, in Hard or Brutal difficulty.
- Add a "Direct Shortcut" option to use devices (drink potions) directly when pressing their shortcut
- Add a "Auto-Save frequency" to choose between 0, 1, 2 or 3 auto-save per day
- Add a "Lock Mouse" option to prevent the mouse going out of screen when ingame (whatever fullscreen or windowed mode)

BUG FIX:
- Ending: cannot activate items from inside the rocket
- Fix the Achievements delay of a few seconds
- Improved pathfinding on ants
- Fix lamp + lighted defenses that were producing enough light to power solar panels

BALANCE
- Volcanic eruption early rising speed reduced

MINOR:
- Corrections in English, Portuguese-Brazil, French texts
- Drone : Better targeting. Do not select if over a selectable object. Fix some messages (when dead, monster kill). Add a message for the basalt+jetpack, another one for the weak monster that doesn't attack when armor mk3
- Texts: reverse lava bush/flower names and descriptions. Modify "+" crafting button description. Add a message preventing save during rocket launch. Remove "T2 kill warning" for monsters damaged by fall or drowning.
- Don't deactivate explosive when far from player