We have a whopper of an update this week, with 6 new levels, 4 player co-op, a new mini-map and tons of polish / bug fixes.
Co-op is currently in beta, so bugs are expected, please help us out by providing feedback in our forums:
http://steamcommunity.com/app/329460/discussions/
Release Notes:
* New: Co-op game mode
* New: 6 new levels
* New: In-Level "Warp Doors"
* New: MiniMap
* New: "3 Star Doors" for Boss Levels
* New: "All Coins" bonus
* Updated: Core Rex Physics
* Updated: Allow Rex to break blocks by Jumping
* Updated: Ghosts are auto-selected when replaying levels
* Fixed: Yeti's Body is now hit by Snow Balls