Unisystem is one of my favourite RP systems, due to its simplicity and robustness. The basic premise is simple: Roll a d10, add attribute ability, and try to beat 10. This version uses the cinematic unisystem, as seen in the Buffy RPG. It is pretty much the same system as used in the other cinematic games.
The setting is interesting, based on the original writings of Lovercraft, but extending them into the future, resulting in a Lovercraftian Space Opera setting. The emphasis of the game is more on exploration and discovery, rather than getting driven insane by gibbering monstrosities (although there are plenty of those, should you be more inclined that way).
While I really like the game, the presentation is far from perfect, with the kindle format making the tables hard to read. The system is not table-intensive, but there are several of them, and they could have been optimised for the kindle screen.