The highest publicly reported .gg sale is sports for $96,000. There are a couple more mid 5 figure sales. Everything else is low 5 figures and less.
Sales for the exact word 'games' in other extensions are similar to the .gg sales.
.gg is popular with gamers, so you probably have the best ccTld for games. Both game and gaming in .gg don't appear to be available, which helps you.
Your $150,000 asking price isn't out of the question for the right end user. Your lease to own is priced well.
If you're looking for a faster sale, I'd suggest lowering your ask to under $100,000. That way you could also lower the lease payments. If not, leave the price as is.
I'd suggest listing the domain on GoDaddy auctions and the Afternic network. That way you'll reach a wider audience.