There are many "Art" pages finished that look like the sample. The full manga will be 50 pages and will come out this year *EDIT: Added more details in an update.
The complete story for Omni Link is finished at around 350 dialogue pages (this is not including non dialogue based pages) A small portion of those pages have been condensed to around 115 pages. And those 115 pages are being adapted for manga and may triple in size once finished. I hope that's not too confusing.
Suffice it to say, the Manga has much done already and I'm pretty confident it will finish up this year with plenty to spare for a 2nd, 3rd, and 4th + issues.