I noticed that as you play, the sprites change. I can only assume that these are new sprites planned for future updates. I personally like the old sprites. Will there be an option to choose between the two?
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No.
The 3/4-facing sprites the game starts and ends with are the new ones. The forward-facing ones in the middle sections are old and gradually being replaced.
The old sprites were done by CursedMarked, who has irrevocably split from the project, and so no more art in that style can be acquired for EA.