1-- upgrade menu allows you to infinitely scroll around the page, allowing you to lose sight and track of where the upgrades are.
2-- add an ugprade to decrease speed of lost energy.
3-- Make the tower not take damage when running into it.
4-- lock screen onto your rocket ship and allow you to fly around like that in order to make the map feel more spacious, versus only being given a limited amount of viewing space of the map.
5-- maybe also add different types of asteroids or ships in these areas as well.