Having three of the same cat type on the ship will expend energy too fast. Only have two of the same type of cats on the ship, as the improved performance is not worth the energy loss.
Restoring hearts
Advance the time on your device for fifteen minutes for each heart you would like restored. Then, set the time to its correct value.
Unlimited daily bonuses
After getting the bonus for the current day, advance the date on your device by a day. You can then collect another daily bonus and repeat the process as many times as desired. Then, set the date back to its correct value.
Upgrades
Start by focusing on the alpaca's upgrades to repair faster. Next, update your weapons.