I like this style! You've definitely got the retro style down, well done!
The commentary when you lose was a particular fun, cool!
A little suggestions:
In windowed mode, there's some kind of shadow over the text, it should be removed
When reaching the finish or dying, it's worth stopping the character, and then on the first level I reached it and immediately died, so the level restarted
At the level where the portals first appear, if you hit the right center portal at high speed, the cube will become unstable and impossible to control.