Thats a really nice prototype, i enjoyed it. I finished the skill tree in like 10 t o15 minutes. But i also see some issues: The UI Text is not really readable, its very tiny and blurry. The upgrades button is not really clickable (you need to find a spot around the text) you might need adjust the trigger area. The border from the continue button is clipping out. But in general a very nice game, keep it up!
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Also adjust the zoom levels for the upgrade screen.
Cause the standard view was okay, but at some point I wante dto zoom out a bit and the next choice was too far out for my taste.
maybe add a zoom stage that is between those 2?
so you have 3 zoom levels: close (the standard zoom), middle and long (the second zoom level you currently have)