I have played a few shoot 'em ups in my time, and decided to give a go to Jamestown: Legend of the Lost Colony, which had apparently been included in some humble bundle. Unfortunately I found it lacking in the parts I like in these kind of games.
What I would've wanted to see in addition to more levels, was purchasable gun and ship upgrades and/or power-ups dropped by enemies. Sadly no such things exist in the game, although there are three unlockable ship types, each coming with different weaponry. I think at least two of them are meant for co-op, though. The one with redirectable secondary fire might work for solo as well but I found myself to be rather bad with it and just finished the game with the ship you start with.
I guess Jamestown comes from a bit different branch of vertical scrolling shooters than what I prefer. These difficult bullet hells are not really my thing. I don't fancy chasing after highscores and seeing myself in online leaderboards that much.
A similar game and much more to my liking, Tyrian 2000, is available on GOG for free. I actually might replay it to see if it was as good as I recall.