We've just updated the game to fix a number of major bugs; we'll have another update in the next day or so with some more tweaks, fixes, and that extra bit of content we promised!
Patch notes:
- Fixed portal occasionally appearing in inaccessible location
- Fixed engine crafting
- Fixed ammo pickups occasionally getting 'stuck' over player's view
- Added mouse rebinding (does not yet allow mouse axes to be rebound)
- Fixed SOME cases of bindings being lost
Hope that's helpful!
Luke