Well, I wanted to teach players how to play it via level design instead of text tutorials. I'm definitely not the best level designer (more than that, these levels are my first attempt in level design stuff), so there are some mistakes like this one. The idea was that the keys stay pressed, and the opposite keys cancel each other (while staying pressed). So, if you press both left and right, you'll stop moving horizontally at all. Seems like this was the idea I couldn't convey clearly, thus causing confusion.
Thanks for your feedback!
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ohh, that's actually a cool design idea! I think if you continue work on this though then it would be good to create a hint or something as it wasn't entirely obvious to me. I might just be being an airhead though! And don't worry, I'm still learning the hard way with level design, my submission for the jam has some pacing issues.