SteamWorld Dig 2 is an amazing game and a must own if you have a Nintendo Switch. It takes everything its predecessor did right, refines it, then presents it to the player in one of the cleanest packages I have seen in a long while. It buries its competition in the metroidvania genre and stands as an example of what others games in the genre should be, instead of what they are. Go pick this one up.
Ironcast is a fun game with great mechanics, set in an interesting world. The game really does not reflect the time frame, but is enjoyable none the less when you move past some of the story and setup elements. Game is a bit short but for the price tag, it's worth picking up.
Path of Exile is one of the best Free to Play games ever created if not the best. With its continual updates, engrossing community, great story, interesting characters, superior voice acting, ability to shape your play style in amazing and interesting ways, and that fact you will have the same play experience if you chose to drop money on it or not: it's simply a home run. Even stacked up against $60 AAA games of the last decade, Path of Exile: The Fall of Oriath crushes 99% of them.
Arms is an amazing game and a break out from standard Nintendo titles. It accommodates a wide range of players and play styles, and has enough in it to make you keep coming back to it daily. Arms, while competitive, is accessible by everyone and anyone. People old enough to remember the Virtual On series will be right at home, and new players will soon follow. This is a must buy.