Really awesome pixel graphics! One can tell that you put a lot of heart into this project. I especially like the knight spawning in hell and the Cerberus character, very cool!
Unfortunately I had trouble with the combat, it feels like you need extremely fast reaction speed and I wasn't able to make it past Gluttony's second phase (I get that you can use the i-frames on the roll but often I was not quick enough, and after my first good attempt I had burned through all of my healing items and broke). I also found it difficult to control the direction of attacks. Eventually after respawning a couple times the sound stopped working?
Besides the points above, this game really has merit and I would have loved to have seen more and I suppose you ran out of time but it would have been cool to see all 7 sins in Cerberus' art style.
Edit: I also wanted to mention that it was a bit annoying having to install the game, I would suggest just giving us the executable next time.