How do I adjust my text size?

My text in my game is too small, but I don’t see any sort of easy “Font size increase” option anywhere. How do I go about increasing the size of my text?

Here’s my game on the Google Play Store. I’d attach a PC build to this post, but that would exceed the limit.

https://play.google.com/store/apps/details?id=com.AnomalousGames.ShapeTapper

What actually would help is telling us how you output the text.
If you’re using a GUI.Label, you can use a GUIStyle parameter:

GUI.Label(Rect(5, 5, 100, 50),"xxx", myScoreStyle);

It’s best to just put the style as a public member on your MonoBehaviour and then have a look in the inspector:

public GUIStyle myScoreStyle;

You may also want to read this:
http://wiki.unity3d.com/index.php?title=SaveFontTexture