Step 1 (recommended): put on an audiobook or some good music
Step 2: Start the game
Step 3: Place the mouse cursor ~1,5 girl heights in front of her (see the image)
Step 4: When a catcus crosses the mouse cursor press left mouse button to jump (if you're jumping late or soon move the cursor left or right)
Step 5: Repeat step 4
Step 6: Do not get distracted (for example an interesting audiobook)
Step 7: Get all achievements (you need to run 100km)
Step 8: Win