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Thanks for your feedback.

To answer your question, Lumiette is a twin stick shooter in addition to being a bullet hell and the default controls reflect that.  The keys can be rebound in the settings, and there is an input setting for regular vertical shooting in there as well - IIRC it is called Fire (Traditional Shmup).

In an upcoming build, I will try out a new default control scheme involving these traditional bullet hell keybinds + have them be reflected as in game tooltips during the tutorial.