These games are all spaceship shooters with interesting and unique features so they are all worth checking out. All the games are on the same page so the link to the download are at the bottom of this post.
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Ref-Lect Ball
Ref-Lect Ball is a spaceship shooter with an interesting twist. You have 1 minute to shoot as many enemies as possible to get the highest score. Luckily enemies don't shoot you. Unfortunately, any of your shots that hit the enemy gets reflected back which you have to avoid.
Controls:
Move - Arrow keys
Shoot - Z
Pause - P
Exit - Esc
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Gradle Unison
Gradle Unison is some kind of abstract bullet avoidance game. Your ship can only move by teleporting and you are trying to avoid an endless barrage of bullets that are fired at you. Each time you teleport you also create a shockwave at the location you teleport to which destroys bullets and increases your score. The size of the shockwave depends on the distance you travel from the previous location, so traveling a further distance creates a larger shockwave.
Controls:
Teleport/Create Shockwave - Left Click or Z
Pause - P
Exit - Esc
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Z-Lock
Here is a suprisingly good game with an interesting concept. The idea is that the more enemies lock on to you the more powerful you become. Of course they are probably shooting at you so you have to move away from the lock-on but then you become less powerful. You can also use the X key to focus all enemy lock-on targets on your ship. This simutaneously makes you super powerful but also causing all enemies to shoot you at your current location (it also has to cool down after use). This game has mutiple levels and six different game modes.
Normal-mode: You can shoot a weak shot even when not locked on by the enemy.
Concept-mode: You can't shoot when not locked on, the Z key automatically functions as the X key, and your gun can overheat.
Original-mode: You can't shoot when not locked on.
Hidden-mode: Enemy bullets gradually disappear (they can still hit you when invisible).
Score attack: Try to get a high score in 3 minutes.
Time attack: Try to get the lowest time to obtain 1 million points.
Controls:
Move - Arrow keys or WASD
Shoot - Z or /
Capture Lock-on - X or \
Pause - P
Exit - Esc
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Area 2048
Area 2048 is a spaceship arena shooter. Kill all enemies in an area to reach the next area. Every 10 levels is a boss fight. You have a special attack bar that can fill up to four levels. When you press the X key you activate a special attack that fires a massive number of bullets at once. There are three different difficulty settings.
Controls:
Move - Arrow keys
Shoot - Z
Special - X
Pause - P
Exit - Esc
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Download (each 6 MB or less):