Celtreos

One or two players. Use a mouse or trackpad, keyboard (including Touch Bar), or 1-2 game controllers.
Steam version works on Mac (available for mobile and TV elsewhere); updated with support for all recent Mac hardware.
“Celtreos” is like the space shooters of decades past: tiny ship, big weapons, waves of foes, power-ups and obstacles.
Music, Sound and Voice
30 different songs (over 45 minutes of music!)

You can even play your own music and auto-next-song for key game events

Stages
13 stages: a city, space station, ocean and more

Horizontal scrolling but more than one “screen” of vertical space

Start from any stage you want!

Each stage ends with a challenging boss

Wall layouts and spawn patterns are partially randomized

Weapon Arrays, Special Moves, Power-Ups and More

Choose from a huge arsenal of weapons and special abilities

10 different ships to choose from

Customize ship properties, such as gun mount locations and top speed

In-game power-ups with weapons, defenses and temporary powers (like Rapid Fire)

Power-down orbs with temporary inconveniences (like Weapon Freeze)

Additional Configuration Options
Set number of lives, and number of times that special abilities can be used

Play in a window or in Full Screen, and specify how much of the display to use in Full Screen

Set graphics quality to one of three levels