If you look at their previous campaign:
https://www.kickstarter.com/projects/neptune/neptune-pine-smartwatch-reinventedThey did deliver, but didn't go too smoothly (took them about a year to short things out for most backers) as some people didn't get it and others are still missing accessories.
And just 18 months later, their website went bye-bye (
http://www.neptunepine.com/), so no support whatsoever and apparently (by reading the comments) they never had google play support, so I guess you'll have to side load everything.
Also, apparently that lack of support was just after they announced the newer neptune suite back in mid August last year.
They did however delivered most of it, but unless you want to deal with self support I wouldn't touch this. Then again maybe they did learn a thing or two during their previous campaign.