Pretty cool game! The graphics were definitely very retro in an MS-DOS kind of way, and some of the areas looked quite pleasant, although the mismatched pixel sizes were a bit painful to look at. I quite liked some of the songs, especially the main menu theme and the song in the cave with torches, though the song playing in the first area felt a bit repetitive.
The player felt a bit slow compared to the enemies, and sometimes it was hard to avoid damage. I couldn't figure out how to deal with the first boss until I realized I could stand inside him and only take contact damage, which was much lower than the damage from his swipes, and at that point I was able to brute force him. Still, nice job!