Awesome, almost perfect
It was very difficult to quit playing this game. I like it because you weren't pushed to finish the level in a certain amount of time. The upgrades were great, and finding all of the items, even with the X-ray, was very challenging. The boss battles as well were unbelievable. I have tried some of the side games, which are fun, but I'm particular to the main quest.
I am a big fan of 8-bit graphics, but the sprites need to be bigger to allow for more detail. It's hard to sympathize with a character who consists of only a few pixels. he music for the intro is good, but it's inconsistent with the rest of the music in the game which is chip tune. I think it's better to stick with one type of music for each game, unless the setting or location calls for it.
Despite the aesthetics, this was a fun game and I give it a high evaluation.