A fantastic art style - I especially like the glowing yellow portals that open up. Inserting them on the roof added some really interesting verticality to the game which I didn't expect!
I agree with some of the other comments that the controls were a little difficult to master, however it played smoothly and I got used to it quickly so not too much of a problem!
Would love to see something with this style of lighting again - I especially love the spawning animation.