Consistify language in tech descriptions/on tech cards. Special consideration should be paid to:

• timing of the effect,
• duration of the effect,
• numeric impact of the effect,
• positivity or negativity (good effects should avoid "no", "not", "never"?),
• target, trigger, or conditions of the effect, if applicable

Display a tech's description in a nice card (with an icon?). Should pause the game until the user gives input.

Scanning/orbit is attained by staying within a band of tolerance for a certain amount of time (total) without crashing or falling out of the gravity well. Success causes your ship to perfectly orbit around a planet.

How to exit orbit? Press a button? Is this free of fuel? (I think it should be)

Spawn planets continuously as the player/camera move. Try not to spawn things directly on the line of the player when it's spawn-time. Don't spawn while ship is under the effect of a gravity well.

When the player scores points via scanning, a +xxx should be displayed over the planet to make it clear how many points you just earned.

Planets should only choose from techs in their class. e.g. Blue planets spawn with tech from the "blue" tech class.

End the game when you run out of fuel, or when you crash-land.

Display an end-game screen. Have a retry button and a quit button. Display the user's final score.

Put techs in classes/families, organized by theme and/or function. (These will be bound to planet types in a bit.)

Shows how many of each type of tech you've collected so far. Not sure if this is important?
e.g. 3 red, 2 blue, 4 green. May help make decisions about which other techs to get.

Create some basic techs. They don't need to plug in to the game at this point. They should have a mechanical effect on the game, or yield points. They should have a description that will later be displayed on tech cards.

Create a prefab for planets

Planets should have a (visible?) gravity well that, once the ship enters it, slowly attracts the ship.

Press space to move in towards the nearest planet; press shift? shift space? to move away from it.

Add a display of the user's current score to the HUD.

Rebalance/intentionally balance how frequently certain planet types show up (based on the tech you can access through them?).

Add a second background and give a parallax effect.

Cause the player (or everything else?) to move forward rapidly through space. Scroll the background and repeat it.

Create a prefab for the ship

Add some techs that can screw you up.

Show the list of techs you had at the end of the game. (Sorted alphabetically and then by class?) Clicking/tapping one displays the tech description on the right.