Good progress since the prototype! I made it all the way until the end without leveling up, now I know from the comments that's something you can do and I remember using it during the prototype, haha. Maybe something like a notice with information about "you're able to level up" or something would help. A nice entry, anyway. Congrats!

>What was the most frustrating moment or aspect?

When I realized the slimes don't seem to do any damage to you.

>What was your favorite moment or aspect?

Countering the whole shmup boss at the end.

>Was there anything you wanted to do, but couldn't?

There were moments initially where I thought I had to balance killing slimes and defending from air attacks. Finding out the slimes don't really damage you ruined the compelling nature of finding that balance. I wanted that aspect in the game as soon as I realized it wasn't actually there.

I really like the countering mechanic, it works really well and is very useful in combat. I also have a suggestion on the leveling up. The fireballs feel very powerful from the start, the sound and size just feels like there's a lot of power behind each hit. I wonder if it could improve some feel of the game to have the fireball spell start out looking weaker and slowly increase in size and power with each level. Just a thought.

It's a very fun game and I like all the art and mechanics!

Looks great.  Plays well.  Controls work well, but jumping is a little stiff and the platforming is pretty limited.   Alot of potential.

Great job.

Here is a playthrough video in case you are stuck.