The controls are a bit disorienting at first, i'd keep the directions the same no matter the orientation of the ship in theese kinds of games, but you get used to it. The main mechanic is really fun and it never gets too old seeing your ship become a huge spike of other ships, Even though maybe they shouldn't shoot in the direction you picked them up at? like i have no use for a second gun that shoots slightly to the left, it would be cool to be able to choose the shoot direction once you pick a ship up. The boss battle was very easy, it didn't last long, and it took a bit for me to find it, adding a permanent indication arrow would make the players feel less lost. Overall it was fun and you had a nice idea for the mechanic :)