From Cinelinx:
Exploration takes center stage in the story-driven flying/puzzle game InnerSpace. While the atmosphere is excellent, some nagging issues hold it back and likely to leave you frustrated.
InnerSpace is free at Epic Games Store starting today and running until March 5 at 10 AM. Once you claim it, it’s yours to keep.
Twitch Prime members can claim April's Free Games with Prime lineup and add even more games to their collection.
Nil Games reviews InnerSpace for FULLSYNC, starting off; "Four hours into InnerSpace and I’ve finally gotten to grips with the various tricks and nuances of the control scheme. I can drift and dive with the best of them, but I’m still not really why I'm doing it."
I really wanted to love this game, and it does some awesome things, but the frustration with certain elements is difficult to get past :(