Hey there!
So, played and beat the game. Here's what I think out it, i'll break it down into parts
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Graphics:
The style and everything in the game fits well together, the sprites and background look very lovely so great job on that for sure! The game looks polished in the graphics department, so I can't wait to see what else you add to it later on. It is visually appealing and charming, once again, kudos for that!
The sounds are fairly nice, especially for this game. Everything sounds just the way you'd expect. I love the sound effect from the sword swings and the different sounds based on the crate/box you break. Although nothing bad, I feel like the sounds from the fast running mini-bosses shouldn't be heard from very long when you get killed. I know you'll fix that, just wanted to make notice of that.
Gameplay:
It is 2 am as of right now, so forgive any typos and what not.
I like the controls, everything feels like it works very well together. Mouse+KB it's cool and very flexible. I would, however, love to see the option to setup your own keys in future updates. There's nothing better than giving people the chance to play the game with whatever buttons they'd like to. Good choice on the standard WASD controls.
My biggest gripe with the game was how slow, during startup, the character's speed is, and then it just goes a bit too fast. You never have full control of the character, especially when it is going at full speed. I think making the start up speed a bit faster would be better unless this is the thing you're going for. This made platforming a lot harder, and in some cases, very unpleasant. Being able to hold my slashes and get critical hits, plus jumping higher was a great thing to have. I loved that a lot, and even more so the ability to have different attacks with unique purposes.
Another thing I didn't like was having to watch my character go from point B to the last checkpoint I got to after getting killed. That was a bit of a bummer since if I made it a bit far, I couldn't skip watching the entire thing. I just wanted to jump right into the action!
Also, I really sucks to get stuck during swings in the air. I would understand it if it were just for a small amount then you went back to the move state, but maaan... I wanted to speed run through the last section of the second level and died because i was stuck on the regular swing state XD.
Keep the updates coming, and keep working hard, it definitely shows the love and dedication you've put into the game. If you ever happen to want to provide me with some feedback, I made a post with my game. I'll update it tomorrow when I wake up. Have a nice rest of the day brother!