I would love if the camera was clamped. And some sound would be nice. But overall great game!

This is indeed basic... but being basic is not necessarily a bad thing. The graphic is minimalistic but pretty nice (really love how you did not need to tell the player what is dangerous because it is already color-coded), and it would have been even nicer if you had added some simple SFX.

There are many ways to expand here. Isn't the core mechanics here that the cube needs to gain different abilities in each new level? The level design is pretty good, but you can make it even better by maybe for example, giving the cube different abilities or ability order in each level. Maybe add some abilities that are not related to jumping (e.g. wall break), and then in some levels maybe the cube can break walls but can only jump much later on. It would make for an interesting puzzle game.

extremely basic, controls feel quite floaty and off just like you used unity forces on a basic cube. I'm sorry but there is very little here to review, apart from the levels that are quite compitently made with a good difficulty curve. but apart from that its just a basic example style plat former, i would recommend finding a core idea and building on it. better luck next time. sorry if this comes off as harsh i hope the best for you and hope you inprove.