Pretty fun platformer! The main feedback I have to give is that there's not much point in leaving ghost form. Your bullets hardly do any damage to the slimes, so there's almost no reason to leave ghost form. What I'd add are some platforms or hazards that can only be crossed by your solid form. I'd also decrease the map size and remove some of the collectibles, because it can get very tedious trying to find the last 1 or 2 bags that you missed.
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Thank you very much! Yep, ghost form is over powered in its current state haha. I do like your idea of having different hazards for different forms as that would make it more interesting. I kinda did run out of time as I wanted to have different platforms for the different forms but it turned out well enough for the jam. Thanks for the solid feedback for me to learn from! :D Enjoy the rest of the jam!