Definitely a lot of content packed in here. I definitely like the style of going for a DOS/MSX feel, but I do feel like that brings up some criticisms. While I like the music, I expected it to be in the same style. Combined with the lack of sound, which I personally would have prioritized over music, it does conflict with your goal of going with that style.
Level design was done well. The puzzles gradually increased in difficulty and the spell mechanics weren't game breaking buggy. I had one close call where I got a statue stuck on me and spamming buttons got me unstuck so I could continue. I do think with the amount of rooms you have, you should have a map. I got lost a little but not too much.
Also, some indication of what powerups do would be a good thing to have. I figured it out quickly enough, but its still a good thing to have.
Overall, I like this entry. While there's definitely room for improvement, I think it stands solidly as is. Congrats!