I cannot think of too much to say really. You made a quality game that used the limitation almost as stated. Great gameplay loop of dodge and shoot, choose a useful little upgrade, and repeat. I will say that I was caught off guard when I shredded through my time after upgrading to shoot 2 bullets at once, for what appeared to be the cost of 2 individual bullets I think? I was expecting to shoot 2 for the price of 1. I suppose your use of the limitation could have been more innovative or unique, but that is just subjective really. And certainly not a requirement. I really liked the simple pixel art and the pixel perfect rotation of the sprites. Fun lil' game. Keep up the good work!