First of all, the animators are absolutely sick. Especially the dash/move animation for the big cube and also the death animation.
Second of all, the idea is really cool. I like the fact that you have to change different sizes while in the air and stuff.
It's definitely a bit tricky at the beginning, but once you get the hang of it, it's really fun.
The jumping and dashing also feels really satisfying. The fact that you have to rewind your jump first and then release it is a bit slow, but I think it feels awesome and it's definitely unique.
One thing I also really enjoyed is the fact that you gave each cube a different personality. It's totally unnecessary, but it's super fun!
The level design and music are also very well executed. Overall, a really cool entry and a cute and nice game. Good job, guys!
PS: I love the dynamic lighting.