I gave the game a 6.5/10 (fair). It was definitely worth playing and look forward to the sequel.
Viewing post in Project Mercury Returns Demo comments
It's heartwarming to see some people looking forward to this sequel, but there's something that needs to be addressed.
At this point, Project Mercury Returns hasn't been worked on in over a year. It's roughly 75% complete. It remains unclear if this will ever be finished. There are several factors behind this.
If I saw a broader demand for more, I'd be open to finishing this thing up.