The free Update 1.5 and the (paid) DLC Taste of Adventure to the game Parkitect are now availabe for Linux on Steam.

The big free update to Version 1.5 and the paid Taste of Adventure expansion are available now.
Here's a summary of all the changes:

Taste of Adventure expansion (paid):

added new campaign with 10 scenarios
added Candyland theme
added Adventure theme
added River Rapids
added Inverting Wooden Coaster
added Inverting Spinning Coaster
added Vertical Spinning Coaster
added Swinging Coaster
added Safari Ride
added Experience
added Clockwork
added Shirts stall
added Sub Sandwiches stall
added Corn Dogs stall
added Cookies stall
added animated door and gate deco pieces
added Lava
added turntable segments for Water Coaster, Boat Dark Ride
added elevator segments for Wild Mouse, Spinning Coaster
added 3D text signs

Version 1.5 (free):

added customizable water color
added custom image signs (+ modding support)
added ride photo sections
added spin lock option to Spinning Coaster
added free park entry/free food/free ride voucher marketing campaigns
added option for continuing to play with all research available after completing all scenario goals
added construction costs/remaining value display to shops/rides info tabs
added color palette randomizer button
added scenario editor tool for marking deco objects as source of bad scenery rating
added scenario editor setting for disallowing building underground
added "win without pausing" scenario goal
added "win without using ride blueprints" scenario goal
added "own at least x tiles of land" scenario goal
added option for resetting campaign progress
added modding support for custom coaster trains
allowed using regular path styles as queues
allowed overlapping staff zones
improved track builder: when deleting a track segment the track builder UI preselects the settings of the removed segment
improved Steam Workshop support: savegames, scenarios and blueprints can be updated now
improved tracked ride animations to be much more smooth
updated Content Manager window to load faster; added search and filters for own/subscribed content
updated fountains to be resizable
updated underwater tunnels to be buildable anywhere
updated guest visualizers to highlight objects with positive or negative influence
updated sandbox mode to award all goal rewards from the start when playing without goals
updated night mode to be remembered in savegames
updated ghost mansion ride to allow more trains
updated blueprint builder window to display approximate cost when building without deco
fixed some rides (like Go-Karts or Calm River Ride) counting as "coaster" in some statistics/goal completion checks
fixed a case where a vandalism wave event notification could get stuck after loading a savegame