I liked it. A bit on the easy side, though. Also, the auras that were supposed to only last one turn (Enforced Silence, Patience, &c) kept hanging around for 6 turns or more, which was really annoying.
5/5. Great old school shooter. Only thing I dislike is that with only three slots for charms you can be fully upgraded halfway through the game. I prefer a more open-ended upgrade system.