This is a very run rouge lite, it has some interesting upgrades that can make things go easier (and sometimes harder) on each playthrough. I really liked the permanent upgrade system and how it works out (also love the idea that its based on the tree on the main screen).
I'm just so bad at these games that I can't find myself to get to the end everytime I play, and it doesn't feel like I'm making any progress or learning too much on the why...except for the bosses, they feel great to beat once you figure out the patterns of their attacks.
I also love the pixel graphics here, so crisp and very nice on the eyes!