I had quite a bit of fun playing this. The main mechanics are quite fun, the combat is intuitive and interesting. The art style is unique and quite eye catching, really like the visual effects. I did saw some problems with the game in it's current state, I know this is still in alpha but here are my thoughts.
-Looking for crystals is quite annoying after a while. Since the map is procedurally
generated and there isn't really specific features. It's hard to remember where
you went and not.
-The "action" part seems a bit slow. This might be fixed in later levels, or with the
dodge. But the character shoots and walks quite slowly. Maybe increasing this
a bit could help.
-When enemies are too close you can't really shoot them and since you walk
quite slowly it's hard to run away from them.
Apart from those things, I had a great time playing this, hope you get trough greenlight!