Great job submitting a game! I love these types of games that have a mechanic that does two things at once. I hadn't heard of Switch-n-shoot until reading the comments, but it looks like you did a good job de-making it to Nokia restrictions in such a short time! My two favorite upgrades were the bigger bullet and the laser. The laser offered a really nice break for a short period. I think this game would've been perfect for turning a Nokia sideways for that extra vertical real estate in 48 x 84.
I liked how the enemy would sometimes stick around at the bottom limiting the space I had to maneuver. Later in the game, when things got hectic, especially when I had the big bullet upgrade, I would lose track of my ship for a second but sometimes that cost me my life. Not sure if its just me or something could be done visually to help. My highest score was 992 with 100% kill and 30% accuracy(lol). I had a lot of fun playing! Thanks for participating!