There are swarms of enemies, and the basic attack won't cover you alone. The space ability is a great concept, but also the game's core fault.
A great addition would be to make the space ability available to use anytime, but the more time you wait to use it, the more powerful the effect. waiting until it fills all the way could give you a special effect, like increased default weapon damage, speed boost, etc.
I also like how you added the section before the room with robots so that you could let the gauge fill up before starting the game, it rewards patience, neat touch