Project Almanac is about a group of friends who stumble across a time machine one of their parents were working on, and finish assembling it. It doesn’t take them long to realize this was a mistake. Alien Outpost is about a documentary crew following an elite unit of soldiers in the wake of an alien invasion. Hard to Be a God has group of scientists is sent to the planet Arkanar to help the local civilization. The movie is Russian, I have no idea why the official site I found for it is in Japan. At least the The Official Site of Arkady and Boris Strugatsky, the folks who wrote the story it is based on, is from there. In Legends from the Sky a Native American Veteran is looking for his missing grandfather after his land is taken over by an unknown federal organization looking for a UFO. Note that some of these are limited engagements and won’t be found in a lot of theaters.