I found this one both hard and easy at the same time. The "battle" sections are very easy, move forward, shoot the fireballs. Perhaps if the enemies also shot back, and you had to jump and dodge, that'd make it a little more challenging.
The hard part was the end-level puzzles. They certainly put me "under pressure!" I solved the first one (after losing once), but the second one got me. There seemed to be a bug with the puzzles? If I failed once, I would then insta-fail on my next lives, which made it tough to move past the puzzles.
I liked a lot of the artwork, especially the cute enemy sprites! I do wish it all matched a little better though, currently the mix of style is noticeable. The music worked well for the game.
I hope you keep working on this! Nice job!