Playtest are running until end of January. There are new Multiplayer modes. You can just join and send invites to up to 3 friends. But everyone can join via the store page anyway.
Version 1.5.1
Fixes
Wrong translation on credits view
Game stats were not reset after leaving
List of available upgrades were out of sync (host <-> clients)
Endscreen was not shown after retry
Version 1.5
Fixes and some improvements
Changes
Path is highlighted with thicker lines
Added endless mode to koop
Fixes
Displayed version on Host view was wrong
Wrong faction on singleplayer
Wrong upgrade selection on client
Data on koop endscreen were not correct
Level ups were triggered on respawn
Version 1.4
New modes (Koop and Versus)
Changes
Implemented Koop mode for up to 4 players
Implemented Versus mode for up to 8 players
Changed auto aim to aim the closest target
Reduced level multiplier for enemies from 10% to 5%
Added difficulty parameter to calculate level multiplier
Fixes
Faction for monsters was wrong
Health bars were hidden behind top wall
Interaction icon for endless mode