Not too shabby; it's a fun and goofy little prototype that I could see growing into something big! I actually felt like I liked the game better before I discovered that I had the ability to shoot. When you can shoot, you can just blast away through everything, but if you can't shoot, you have to dodge around the interesting bouncing enemies you've set up, which is a lot of fun and very challenging. Maybe make it so that the bike transforms into gun mode only at bosses, but for everything else, it's in speed mode where you just dodge through enemies. Obviously it could use some polish: animated sprites, smaller hitboxes, more special effects and such for pizazz, etc, etc, just don't lose those sound effects, haha!