When you find yourself jumping too far when the game speeds up you can help avoid this by rolling (swipe down) when you jump as doing this makes your character zip to the ground.
Return to the surface whenever possible so you can sell the items you’ve found and buy useful digging gear.
To unlock the Gold trophy you need to earn ALL the trophies in Mini-Games, Puzzle, and Survival modes.
Keep an eye on the status bar on the right as it indicates the condition of each unit you tap on along with the status of any spells or buffs cast on them.
Find an Infinite mode that complements your play style ie. Dodging, shooting or memorizing patterns and then mine that level for medals so you can unlock new, more powerful ships.
If you strafe across the screen when a barrage of alien bullets are flying at you you’ll be able to destroy a couple of enemy ships while dodging their fire.
Complete the ‘Challenge’ pack to unlock the ‘Bonus’ pack.