First person platformer without mouse is quite tough. It's a good thing death isn't implemented, given that moving around inside this sphere gives amazing sensations! It's a really cool interpretation of the theme.
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The sliding doesn't help with that. I went at it again on sunday and made death work, but also fine-tuned the player controller; by making the player stick to surfaces properly, and implementing a (smaller) double jump, the controls are a lot more precise and forgiving. Glad you enjoyed nonetheless.