WSAD - Movement
Enter - Bring up your speech bubble and type!
Bump into people repeatedly to have a conversation, just like in real life.

Say words to / WACKY / characters and have them say words to you - or not directed at anyone in particular!

Hint: Take note of highlighted words, perhaps repeat them to really cement their meaning.

There are 4 effects you can trigger (no requirement to be nearby objects to trigger them)

9 unique interactions - many give a hint on what to say to win the game. Or just a meme.

If it's too cryptic, the phrases are in the comments.

Life out of the Doghouse: a Word-Type game screenshots