I like Space.
Boy did this one surprise me, the freedom of movement is incredible. From your gravity hook, jetpack, anti grav pick ups, moving around truly feels great. It feels a little like Metroid. Due to the aspect of the isloation of an unitentional and forced exploration of a new planet.
Some creatures being hostile and some not. Of course if you want to be crass you can draw comparisons to Terraria and Starbound without the crafting. But the movement and art style, I really like the art style, are enough to distinguish it apart. The weapons are diverse, effective and fun to use. The campaign is level based. Each with different objectives. Some are simple get to a certain location and others task with destroying certain targets or rescue missions for yor fallen comrades. I found that the physics here are slightly at odds with themself as tethering yourself to a human allows you to pull them up and simultaneously jump off of them pulling you both upward. Perhaps this was a happy conceit for pulling your buds out of harms way.
Absolutely phenomenal soundtrack, It really makes you want to just explore a cave. Its exciting in a wonderous way. Definitely one of my favorite and more memorable indie games ever.