Hey! I’ll have a go at answering these.
I feel like whatever I write sounds really similar to Buckets and Bolts.
Direct copying of text of those games is prohibited, but it’s unsurprising if what you’re writing sounds similar. Are you more concerned about the rules or the prompts/questions?
I saw other game jams where creators put a price tag on their games.
Pricing is a tricky one. If you’re proud of what you made, I’d recommend charging at least $1 for it, probably $5. If someone is interested in the pitch and you’ve executed on it, it’s probably worth at least that.
I read about copyright but don’t know how to attribute my game.
There are a couple of examples of attribution on the bottom of the licensing page. One of those with the link to the SRD would be perfect.