Mad Bullets is a good on-rails shooter that harkens back to the classic arcade cabinet days. Its cartoony art style is a fun contrast from the more serious games on the market. Its unpredictability will keep you guessing while going for the high score. Definitely recommended.
If you like light gun shooters, Western themes, or want a very straightforward action game, you've got nothing to lose by giving Mad Bullets a shot. Its tight economy combined with the lack of gameplay variety may end up chasing you away in the end, but you'll have a great time until it does.