Hey that's pretty charming and simple! It was kind of clear e. g. what walls do without reading manual, and that's a lot!
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Thank you for playing my entry!
I took a lot of inspiration from GMTK's video on Mario (introducing the concept in a safe environment then developing it) so I wanted the game to teach you its rules through the level design.
You don't really need the "manual" but in case you got stuck, there's the rules on the game page too :)