Great game.
This game is awesome.
Characters were rather well developed,and graphics were pleasing to the eye.The music was wonderful.
The game had plenty of room for the player to think of various strategies to play the game,which enhances re-playability(after all,there is more than one way to win this game).Not to mention there are,I suppose,various endings,further enhancing re-playability.
Just like what Blackfang2023 had mentioned,the story is what makes the game one of the better games of side scrolling shooters.Of course,it also scores points for how complex the game really is-like stats,upgrades,weapons,etc.
I liked how when the spaceship went up and down the screen,the background and the obstacles seem to move relative to the spaceship's position.
I found the obstacles to be a bit unnerving,though,and perhaps a trifle unrealistic.For example,my projectiles(and the enemy's) were blocked by things like leaves,branches,rocks etc.Personally,when technology is so advanced,such obstacles get blasted out of the way with just a laser beam.
I also found it rather annoying that while some obstacles cannot be shot through,they can be flown through by enemy ships(For example,in Fortress City if I'm not wrong).
Of course,the game is still,in my opinion,perfect in its own right.I enjoyed playing the game and I'm sure you enjoyed making the game as much as I enjoyed playing it.Hope to see more of your work.