Thanks! The text is indeed a bit small and thin on the phone, though it's actually much more legible than I was expecting (using Skala Preview to design right on the phone).
That being said, the upgrade interface is going to be going through an overhaul as I am changing the way you upgrade your ship. It'll be more research / skill tree. How it works now is just clicking a single "upgrade weapon" button and it changes a lot of different factors about the weapon. The skill tree will allow for a more granular approach to upgrading, affording more choice for the user.
This is a super super rough test mockup of what the upgrade tree
could be (for the missile).