Alright, gave it another shot, as my first attempt at the game went not so great and I was left confused in the end.
So this time I was able to actually complete the levels, as before I couldn't pass the final level, simply because I didn't know that you can move the platforms (This was due to the controls not being listed in the game or the game page)
So, I'll start with my thoughts about gameplay - The dimension change mechanic wasn't really fleshed out in my opinion. I just simply couldn't comprehend it's use and what it exactly does. Moreover, while using it you cannot press "enter" key as the player spawns into the nonexistant world and the player falls out of the world. This is gamebreaking, because as far as I am aware there is no restart button, so you have to start over.
Now, there is another aspect to the game, which is the platform movement mechanic where you can click and move platforms around wherever you feel like. And it worked quite well, except that in pretty much all of the levels (except last one) you didn't even need to use it. The platforms that are movable also didn't stand out from the rest which made it difficult to know what's movable and what's not. (I was missing hints or a small tutorial, it really could have helped the game to be more understandable)
I think having both of these mechanics at once doesn't help the game, it makes it more confusing than it should be. What would be better is to have one mechanic that's very polished and build around that instead.
Art - I have no complaints there, it's minimalistic. Like it.
SFX - Background track was pretty good as well. Props to audio guy, nice beat, doesn't distract the player while also giving it more of "focus" feel on the game due to the tight snare and drum kick.
Overall, the game has potential, but does require some extra work to bring it to more enjoyable state. Hope this helps! Thanks.