I had a look around the website and formed a few opinions:
Easy to navigate, clean and professional site. It's a family business and seems fairly new, so best of luck to it.
Book covers are okay, but not great -- 'Pocket Rocket' would probably look nice in print, but in thumbnail form the text is near unreadable which could have significant impact on sales of e-books. The poorly resized Vertigo cover image really needs replacing.
Looks like they don't do e-books at the moment, which I find unusual in this day and age
I can't find Vertigo online because it's a common book title and there's no listed editor, which seems strange. Pocket Rocket is
on sale here.
Their
'For Writers' page is nicely put together, and shows knowledge of the publishing industry.
The blog is extremely rarely updated.
It seems like they have a lot of enthusiasm and potential, but no publishing credentials as of yet. I'd be excited to see where they go in the future, but I'd be cautious about submitting until they've built up a reputation.
There's noticeable potential for confusion with
this .co.uk site since this Nemesis Publishing is also based within the British Isles (Isle of Man).
EDIT: After thinking on it further, I actually find it a worrying sign that "Vertigo" (released after "Pocket Rocket") has very sparse information listed on their site compared to "Pocket Rocket". No Events, no blog posts... very little evidence of any publicity efforts.
Also there's no 'buy' links anywhere on the publishers site. Even though they mention a direct-from-site ordering system is 'coming soon' I'd expect some links to online bookstores where you can buy their books.
As much as I hate criticizing start-ups, I'm having serious doubts about this team's ability to promote.