Pretty good so far although there's a lot to be done still.
Mechanics:
The core mechanic is pretty nice, although perhaps you could have a few more attacks in your chain. Like first strike leads to a different second strike leads to a third strike, etc...
This is visually more interesting also.
Additionally while I see that you're supposed to pay attention to the enemy colors (ala Guacamelee), it's far too easy in this game to just macro the space bar and the left click to repeatedly trigger and just run into everything. Guacamelee puts in a slight delay during and after switching along with a forced animation which forces the player to strategically switch and avoid getting hit while doing so.
The level design isn't bad, but it's much too... boring? For a game like this you actually could go full out Metroidvania-style with your level design without compromising any gameplay. That and it would keep the game interesting.
Visual:
The 2.5D works, but colors are okay. The colors work for a while, but it gets very eyestraining after a very short while. Perhaps consider using various color schemes (triadic, complementary) to add highlights which can also enhance the player's experience. That or use those color schemes to make certain things pop out more such as enemy attacks or your own attacks.
Of course all of this is my opinion and what you do is based upon your design goal. But those are some suggestions~
Keep it up~!
~Phyrnna ^_^