I think a question we need to ask before getting too deep into the weeds with this is: are you planning on creating a game in JavaScript (and Hype) without knowing JavaScript?
Here’s a great search term to start with so you can see what this type of interactivity entails: Search results for ‘collision’ - Tumult Forums
There’s few built in tools for creating this type of game in Hype but knowing more about what you’re trying to build will be super helpful.