Space Game Ideas

[zero00]

I've been looking at other space games, and decided to try making another game.

Version 1
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This is the "engine" for the game. It has:

-An upgrade system! The first upgrade increases your speed! Subsequent upgrades increase your firepower!

-Flipping! Press Enter to turn the ship to the front or back! Now you shoot at enemies behind you!

-A day-to-night cycle! (Granted, one of my other games has this, but I'm bringing it back) A muzzle flash has also been added!
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Version 2
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-Death Animation (not complete)
-Transitions between the Infinite Ocean and the Planet Surface
-The Force Sword!
-The Force Sword drains energy from your force supply!
-Force recharges when you are not firing your weapons
-Improved Day/Night Cycle
-Some HUD Elements (Stock counter non-functional)
-Waves appear when you are close to the ground/water
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Version 3
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-Working Number Counters

-Lives and Credits System
-Instead of a health points system, like my other game, you will
die in one hit. However, you instead will have many lives as well
as continues

-Urchin Force Added!
-Incomplete. Urchin cannot be killed, but it can hurt you.

-Brief period of Invincibility after dying
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Controls
Arrow keys = move
Space bar = shoot
Enter = Flip
1 = upgrade the ship

Controls Added in Version 2!
A = Death Animation test
B = Transition
Hold Space for Force Sword

Try it now! What do you think I should add to this? (as in features, enemies, etc)

Version 3:
http://www.mediafire.com/file/0qt4hw...iplanet_v5.a2w
Version 2: http://www.mediafire.com/file/022xx7...igiplanet2.a2w