This is surprisingly good, its difficult yet fair and also like a bullet-hell. This is fun to play, i just have to ask a couple changes. Try to make it so you can actually fight the enemies for a bit before going to the boss, cause there is just too many bullets to the point where you can't dodge most of them. Also make the upgrades via scrap and the coins easier to get. You can also make sure that everything has a balance and reason cause beam seems useless and turbo deals too much damage so quickly. please also give an explanation on what moves of a kind of ship do so you can understand the moves.
This is an amazing game still and with a little bit of work could be amazing