A map or UI element would be a great idea, I'll add that in. The energy to move goes up as a proportion of your power, keeps you from being able to move across the whole map in one go later on. The obscuring and selection problems when you get bigger are definitely an issue, and somewhat a product of the jam-game nature of the design. Different colors for other devourers is a good idea and should be easy to implement.
During the jam, I attempted to avoid having too many on-screen elements and keep things as one-buttonable as possible, but the scope definitely grew out of the realm where that is convenient to do. For the next pass, here's what I'm thinking:
- More information on placards near what you hover over instead of in the corner
- UI elements for defending yourself and healing, so you don't have to try to click on yourself and accidentally do other things, or vice-versa
- Past a certain size ratio to planets, a UI bubble that appears when mousing near the planet that you can click instead of the planet shape (for when the planets are relatively small)
- A minimap showing the location of planets and other devourers, with basic size information
Thanks again for playing and the feedback, I can't express how much it is appreciated!