Hello, I'm trying to find an old shoot em' up game, I played it like 15 years ago.

Here's everything I remember:

- The level selection was on a map that was a graph (circles in which you could choose to go and edges that connect them). (I think, but not sure that sometimes the enemy could get a defeated area back).

- On the map you had a difficulty: value information.

- The menus had an old software style (buttons, dropdowns...)

- You could choose before starting from multiple ships. There were quite a few with different characteristics (health,speed,amount of weapons).

- You had bombs/nukes that dealt area damage.

- At the end of a level you either fought a big ship or a station that was made of destroyable parts.

- You could upgrade your ship between maps.

- It was in space.

- It was top/down, the enemies came from the top and you could move around the screen.

- It was free