As a devoted game collector of collecting games for 20 years, I will not buy this game till it gets a full and original retail release. Usually, the realm of downloadable games is confined to cheap, casual, and low-budget games. That's where it belongs.
However, Beginning with Mega Man 9, suppose-to-be-major titles have been published in downloadable formats only, Although I see Mega Man 9 and 10 are not HD so it seemed reasonable.
But Sonic 4 is HD, yet downloadable only. Sega already announced their another major HD blockbuster, Afterburner Climax, is going to be downloadable only. If this trend persists, the next-next gen consoles will more and more resort to downloadable formats. Eventually we will face the END of game collecting when the internet can hold 50GB per sec. Much like niche of music and book collecting is completely devastated by MP3s and Adobe PDFs.
Downloading is for those who play games. Those who play and CARE games should not endorse a ghost product without a body, which is deprived of a box, a manual, and a medium itself.
Before and around the time when Episode 2 and 3 come out, I think all fellow collectors should sign petitions that combine all episodes and release it into a physical and complete version.