Hard, but not too hard, I'd say! Felt like I was making some progress all the time, and dying was quick and fast respawn so it was easy to get on with 'just one more try'. Eventually completed it! :D The only "issue" I had with it, was the fact that there is no indicator for when an enemy will spawn, and spawning was not suppressed by player presence, it made it possible to run in a perfectly safe level only to suddenly restarting because an enemy spawned on the player. It was a bit frustrating. But other than that, fun game! I'd also like a timer or similar, so it would be fun to come back to this later for a high-score. :D