Update README instructions

Author: brianyu28

README.md

@@ -1,3 +1,32 @@
 # Tenacity
 
-A computational thinking experience by Brian Yu
+![Planets](screenshots/planets.png)
+
+A game based on the principles of computer programming.
+
+**Play the game at <https://tenacity.brianyu.me/>**
+
+## Gameplay
+
+![Mercury mission](screenshots/mercury_mission.png)
+
+The game follows a rover named Tenacity as it travels across four planets: Mercury, Venus, Earth, and Mars. On each planet, Tenacity needs your help to complete its missions. Program Tenacity by giving it instructions to follow to help it achieve each of its objectives.
+
+![Venus mission](screenshots/venus_mission.png)
+
+Each planet is focused on one new computational thinking principle.
+
+* On **Mercury**, players are introduced to **functions**.
+* On **Venus**, players are introduced to **loops**.
+* On **Earth**, players are introduced to **conditions**.
+* On **Mars**, players are introduced to **variables**.
+
+## Contact
+
+I'm [Brian Yu](https://brianyu.me/), and I developed
+Tenacity as part of a project at
+Harvard's Graduate School of Education.
+I would love to hear your thoughts and feedback on the experience: you can reach me at
+<brian@brianyu.me>.
+
+

screenshots/mercury_mission.png

@@ -16,8 +16,8 @@ import { CANVAS_WIDTH, CANVAS_HEIGHT } from '../game/constants';
 import { remaining_blocks } from '../game/blocks';
 
 // Skip certain sequences
-const DEV_MODE = false;
-const START_PLANET = 0;
+const DEV_MODE = true;
+const START_PLANET = 1;
 const START_MISSION = 0;
 
 const ACTION = {

screenshots/planets.png

@@ -404,6 +404,7 @@ export const PLANETS = [
           [BLOCK_NAMES.END_REPEAT, 1],
         ],
         items: [
+          {...d, id: 'rocket', object: OBJECTS.ROCKET, x: 100},
           {...d, id: 'mountain1', object: OBJECTS.MOUNTAIN, x: 200},
           {...d, id: 'mountain2', object: OBJECTS.MOUNTAIN, x: 400},
           {...d, id: 'mountain3', object: OBJECTS.MOUNTAIN, x: 700},