The screen region is pretty small. It makes it hard to see what's ahead or below you as you run.
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And I have no idea what any of these shapes that I see do, other than I control a red rectangle and I can jump on dirt w/ grass. Everything else I cannot tell what they do, they all just seem the same to me, some slow me down, others speed me up. some can move, others cannot. If there was some kind of way to explain to the player (hopefully w/ relying on text to flat out say it (show it, don't tell it)) so they know what's happening.