Signs of Life is a game very much focused on exploration and creation, and it does both very well. You start off in a pod filled with only the basics(such as a gun and a single bullet, if being the only one on a planet gets too boring) and a sassy artificial intelligence that doesn't quite understand the meaning of empathy. From there, you must run, punch, and scream your way to a better home.
The graphics and soundtrack are both very pleasing, the crafting system is delightful once you build yourself a nice workshop, and the general building mechanics are pretty well executed. The combat, however, lacks in a way that most sidescrollers do: It's not very dynamic. Despite this, the enemies, or at least the ones that are a threat, are well designed. You can power through them, but their gimmicks enable you to employ some neat tactics to make it a bit more fun.
Signs of Life also does not hold your hand. There's no real tutorial and you're mostly left to figure out everything yourself. Most people I've seen get confused with(what I'd call) the story progression of the game, though there are enough hints left about it to where you can eventually figure it out, and be mad at yourself for not doing so sooner.
The developer is fantastic. They're very engaged with the community, and get right on any issues you may be having. It's worth noting that I had no issues at all until I opted into the beta, and the issues I had there were patched an hour after I contacted them. For an early access game, Signs of Life is incredibly stable and well thought out.
Overall, 9/10 Easily.