dont like the art very much otherwise very good game
A fun way to burn time. I enjoy the fact you get an upgrade after each stage, and none are particularly useless, all having their own strengths (turrets and hexes for defense, turrets being able to hit invisible enemies, etc) so as to create a feeling of progression. I do have a minor gripe in that while the background fades to make you visible, the HUD doesn't, and should pale at least slightly to show enemies that are behind it (however long that lasts).
Good game. Liked it a lot.