Hello, thanks for the query. You may use the free sounds in your game so long as you provide credits to DHSFX with a website link to dhsfx (dot) co.uk. Thanks for the kind words too!
If you wouldn't mind, I would potentially like to feature your future game in a short showreel should you be comfortable with this. Please let me know when your project is complete and I'd love to put it on my public list of games which have incorporated my assets.
Best of luck with the development!