Very cool concept of idea! I liked this game. I will be waiting for future levels. But what is the mechanical dfference of dash and double jump? Because both are meant to allow player to get to further objects. Also, if you have fast fingers you can accidentally get on top of the level :)
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Dash + double jump will get you further rather than using one of them, and dash doesn't work vertically unless you are using jump - then your full speed will be horizontal speed multiplied by dash plus vertical jump speed (that will give maximum reach).
Also, in the second level the platform with the key is unreachable unless you use both jump and dash mechanics and your shadow mechanics. I know some players managed to find workaround :D by climbing outside of the level. I will change the position of the key in this level in the next update :D