I am done with the slaughter... Sorry to the people, who kept about a third of the entries - I didn't put every suggestion on the scales to see whether it would meet the minimum requirements of a decent theme. Instead, I asked myself "does this strike a chord with me?" I know, it's very unscientific, completely arbitrary, but this is what remained (for the most part, I wasn't even consistent and did not click duplicates on purpose with the exception of "dice" and "dices" that were in close proximity to each other):

• vacation
• help from AI
• classic PC game
• kittens
• ghosts
• Hold and Release
• Control Level not Player
• Protect the objective
• campsite
• arcade
• game in a game
• road trip
• bastion
• table
• go green, go nuclear
• build and barter
• road
• educational
• revolution
• medicine
• gravity
• barter
• scroll
• judge
• laboratory
• medieval dystopia
• falafel
• Volcano!
• Everest
• Forbidden territory
• newspaper
• anthropomorphic Cyberpunk
• changing gravity
• cycling
• camping
• travel
• lockpicking minigame
• dices
• dice
• treasure map
• tournament
• tidy
• seasons
• heist