The game's very difficult for me, but very fun. I've been coming back to this game several times since it was posted, and each time it's a blast. The randomly chosen backgrounds, enemies and events keep the game from getting too stale. There's a good sense of polish and stuff that just feels right, like the little number 1s that fly out of enemies in a random direction when you hit them or the classy text that appears when a random event happens. What stands out to be the most is this game has a lot of personality, especially with the unique and interesting enemy design.
The sound effects are very fitting and the music is fun.
Graphics are very solid and colorful. It's a nice diversion from the spaceships on top of blackness commonly found in games of the same genre.
There's a bug with being asked to submit your score twice in a row, but it's not a very big deal. There's also the fact that you can't really control Milford when you move your mouse outside the frame, but I only find myself in that situation every now and then.
Overall, this is a quality game that I sincerely enjoy it. The pros really outweigh the few cons I've found.