I did not finish the game because after many tries of getting up a huge building I gave up, so I don't know what would happen after this sequence in terms of platforming or enemies.
What I played, minus the frustration, I liked. The art style is pretty cool, I'm a big fan of these low poly voxel styles that are enhances by light and shadow and neon colors. It was a bit dark in some area but overall it looked pretty good.
The controls and shooting were also fine, it could feel a bit better to hit enemies but I liked your particle effects, especially when the gun was fully charged and you blast this charge to jump.
The level design was a bit unforgiving for the platformer parts. You had to be rather precise. If the blast jump would have been a bit stronger or the platforms a bit closer together it would have felt better.
The staircase, it was also mentioned in a comment, was tricky but I think it's a nice to have variety in the levels. Coming from the street, entering a house, running to the top of the building and jumping out of a windows is cool. Maybe something like this would work better:
I enjoyed playing it and will give it another try. Well done!